Easily handle day to day CLI operation via Python instead of regular Bash programs.

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Overview

pz

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Ever wished to use Python in Bash? Would you choose the Python syntax over sed, awk, ...? Should you exactly know what command would you use in Python, but you end up querying man again and again, read further. The utility allows you to pythonize the shell: to pipe arbitrary contents through pz, loaded with your tiny Python script.

How? Simply meddle with the s variable. Example: appending '.com' to every line.

$ echo -e "example\nwikipedia" | pz 's += ".com"'
example.com
wikipedia.com

Installation

Install with a single command from PyPi.

pip3 install pz    

Or download and launch the pz file from here.

Examples

How does your data look when pythonized via pz? Which Bash programs may the utility substitute?

Extract a substring

Just use the [:] notation.

echo "hello world" | pz s[6:]  # world

Note that suppressing quotes around the argument may not work (Zsh) or lead to an unexpected behaviour: touch s1 && echo "hello" | pz s[1]Exception: . Use echo "hello" | pz 's[1]' instead.

Prepend to every line in a stream

We prepend the length of the line.

# let's use the f-string `--format` flag
tail -f /var/log/syslog | pz -f '{len(s)}: {s}' 

# or do it the long way, explicitly setting the `s` variable
tail -f /var/log/syslog | pz 's = str(len(s)) + ": " + s'

Converting to uppercase

Replacing | tr '[:upper:]' '[:lower:]'.

echo "HELLO" | pz s.lower  # "hello"

Parsing numbers

Replacing cut. Note you can chain multiple pz calls. Split by a comma ',', then use n to access the line converted to a number.

echo "hello,5" | pz 's.split(",")[1]' | pz n+7  # 12

Find out all URLs in a text

Replacing sed. We know that all functions from the re library are already included, ex: "findall".

# either use the `--findall` flag
pz --findall "(https?://[^\s]+)" < file.log

# or expand the full command to which is the `--findall` flag equivalent
pz "findall(r'(https?://[^\s]+)', s)" < file.log

If chained, you can open all the URLs in the current web browser. Note that the function webbrowser.open gets auto-imported from the standard library.

pz --findall "(https?://[^\s]+)" < file.log | pz webbrowser.open

Sum numbers

Replacing | awk '{count+=$1} END{print count}' or | paste -sd+ | bc. Just use sum in the --end clause.

# internally changed to --end `s = sum(numbers)`
echo -e "1\n2\n3\n4" | pz --end sum  # 10

Keep unique lines

Replacing | sort | uniq makes little sense, but the demonstration gives you the idea. We initialize a set c (like a collection). When processing a line, skip is set to True if already seen.

$ echo -e "1\n2\n2\n3" | pz "skip = s in c; c.add(s)"  --setup "c=set()"
1
2
3

However, an advantage over | sort | uniq comes when handling a stream. You see unique lines instantly, without waiting a stream to finish. Useful when using with tail --follow.

Alternatively, to assure the values are sorted, we can make a use of --end flag that produces the output after the processing finished.

echo -e "1\n2\n2\n3" | pz "S.add(s)" --end "sorted(S)" -0

Note that we used the variable S which is initialized by default to an empty set (hence we do not have to use --setup at all) and the flag -0 to prevent the processing from output (we do not have to use skip parameter then).

(Strictly speaking we could omit -0 too. If you use the verbose -v flag, you would see the command changed to s = S.add(s) internally. And since set.add produces None output, it is the same as if it was skipped.)

We can omit (s) in the main clause and hence get rid of the quotes all together.

echo -e "1\n2\n2\n3" | pz S.add --end "sorted(S)"

Nevertheless, the most straightforward approach would involve the lines variable, available when using the --end clause.

echo -e "1\n2\n2\n3" | pz --end "sorted(set(lines))"

Counting words

We split the line to get the words and put them in S, a global instance of the set. Then, we print the set length to get the number of unique words.

echo -e "red green\nblue red green" | pz 'S.update(s.split())' --end 'len(S)'  # 3

But what if we want to get the most common words and the count of its usages? Let's use C, a global instance of the collections.Counter. We see then the red is the most_common word and has been used 2 times.

$ echo -e "red green\nblue red green" | pz 'C.update(s.split())' --end C.most_common
red, 2
green, 2
blue, 1

Fetching web content

Accessing internet is easy thanks to the requests library. Here, we fetch example.com, grep it for all lines containing "href" and print them out while stripping spaces.

More information...

">
$ echo "http://example.com" | pz 'requests.get(s).content' | grep href | pz s.strip 
<p>"https://www.iana.org/domains/example">More information...</a>

>

To see how auto-import are resolved, use the verbose mode. (Notice the line Importing requests.)

More information...

">
$ echo "http://example.com" | pz 'requests.get(s).content' -v | grep href | pz s.strip 
Changing the command clause to: s = requests.get(s).content
Importing requests
<p>"https://www.iana.org/domains/example">More information...</a>

>

Handling nested quotes

To match every line that has a quoted expressions and print out the quoted contents, you may serve yourself of Python triple quotes. In the example below, an apostrophe is used to delimit the COMMAND flag. If we used an apostrophe in the text, we would have to slash it. Instead, triple quotes might improve readability.

echo -e 'hello "world".' | pz 'match(r"""[^"]*"(.*)".""", s)' # world

In that case, even better is to use the --match flag to get rid of the quoting as much as possible.

echo -e 'hello "world".' | pz --match '[^"]*"(.*)"'  # world

Computing factorial

Take a look at multiple ways. The simplest is to use the function.

echo 5 | pz factorial  # 120

What happens in the background? factorial is available from math.factorial. Since it is a callable, we try to put current line as the parameter: factorial(s). Since s = "5" which means a string, it fails. It then tries to use factorial(n) where n is current line automatically fetched to a number. That works.

Harder way? Let's use math.prod then.

echo 5 | pz 'prod(i for i in range(1,n+1))'  # 120

Without any built-in library? Let's just use a for-cycle. Process all numbers from 1 to n (which is 5) and multiply to product. Finally, assign n to s which is output.

echo 5 | pz 'for c in range(1,n): n*= c ; s = n'   # 120

Using generator will print a factorial for every number from 1 to -g.

$ pz factorial -g5
1
2
6
24
120

Read CSV

As csv is one of the auto-imported libraries, we may directly access instantiate the reader object. In the following example, we output the second element of every line either progressively or at once when processing finished.

# output line by line
echo '"a","b1,b2,b3","c"' | pz "(x[1] for x in csv.reader([s]))"  # "b1,b2,b3"

# output at the end
echo '"a","b1,b2,b3","c"' | pz --end "(x[1] for x in csv.reader(lines))"  # "b1,b2,b3"   

Generate random number

First, take a look how to stream random numbers to 100 in Bash.

while :; do echo $((1+$RANDOM%100)); done

Now examine pure Python solution, without having pz involved.

python3 -c "while True: from random import randint; print(randint(1,100))"

Using pz, we relieve the cycle handling and importing burden from the command.

pz "randint(1,100)" --generate=0

Let's generate few random strings of variable length 1 to 30. When generator flag is used without a number, it cycles five times.

pz "''.join(random.choice(string.ascii_letters) for _ in range(randint(1,30)))" -S "import string" -g

Average a stream value

Let's have a stream and output the average value.

# print out current line `count` and current average `sum/count`
$ while :; do echo $((1 + $RANDOM % 100)) ; sleep 0.1; done | pz 'sum+=n;s=count, sum/count' --setup "sum=0"
1, 38.0
2, 67.0
3, 62.0
4, 49.75

# print out every 10 000 lines
# (thanks to `not i % 10000` expression) 
$ while :; do echo $((1 + $RANDOM % 100)) ;  done | pz 'sum+=n;s=sum/count; s = (count,s) if not count % 10000 else ""' --setup "sum=0"
10000, 50.9058
20000, 50.7344
30000, 50.693466666666666
40000, 50.5904

How can this be simplified? Let's use an infinite generator -g0. As we know, n is given current line number by the generator and i is by default implicitly declared to i=0 so we use it to hold the sum. No setup clause needed. No Bash cycle needed.

$ pz "i+=randint(1,100); s = (n,i/n) if not n % 10000 else ''" -g0
10000, 49.9488
20000, 50.5399
30000, 50.39906666666667
40000, 50.494425

Multiline statements

Should you need to evaluate a short multiline statement, use standard multiline statements, supported by Bash.

2: s = 'bigger' else: s = 'smaller' " smaller bigger bigger">
$ echo -e "1\n2\n3" | pz "if n > 2:
  s = 'bigger'
else:
  s = 'smaller'
"
smaller
bigger
bigger

Simple progress bar

Simulate a lengthy processing by generating a long sequence of numbers (as they are not needed, we throw them away by 1>/dev/null). On every 100th line, we move cursor up (\033[1A), clear line (\033[K) and print to STDERR current status.

/dev/null ... 100 ... # replaced by ... 200 ...">
$ seq 1 100000 | pz 's = f"\033[1A\033[K ... {count} ..." if count % 100 == 0 else None ' --stderr 1>/dev/null
 ... 100 ...  # replaced by ... 200 ...

Docs

Scope variables

In the script scope, you have access to the following variables:

s – current line

Change it according to your needs

echo 5 | pz 's += "4"'  # 54 

n – current line converted to an int (or float) if possible

echo 5 | pz n+2  # 7
echo 5.2 | pz n+2  # 7.2

b – current line as a byte-string

Sometimes the input cannot be converted to str easily. A warning is output, however, you can still operate with raw bytes.

echo -e '\x80 invalid line' | pz s
Cannot parse line correctly: b'\x80 invalid line'
� invalid line

# use the `--quiet` flag to suppress the warning, then decode the bytes
echo -e '\x80 invalid line' | pz 'b.decode("cp1250")' --quiet
€ invalid line

count – current line number

# display every 1_000nth line
$ pz -g0 n*3 | pz "n if not count % 1000 else None"
3000
6000
9000

# the same, using the `--filter` flag
$ pz -g0 n*3 | pz -F "not count % 1000"

text – whole text, all lines together

Not available with the --overflow-safe flag set nor in the main clause unless the --whole flag set. Ex: get character count (an alternative to | wc -c).

echo -e "hello\nworld" | pz --end 'len(text)' # 11

When used in the main clause, an error appears.

name 'text' is not defined on line: 1">
$ echo -e "1\n2\n3" | pz 'len(text)'
Did not you forget to use --text?
Exception: <class 'NameError'> name 'text' is not defined on line: 1

Appending --whole helps, but the result is processed for every line.

$ echo -e "1\n2\n3" | pz 'len(text)' -w 
5
5
5

Appending -1 makes sure the statement gets computed only once.

$ echo -e "1\n2\n3" | pz 'len(text)' -w1
5

lines – list of lines so far processed

Not available with the --overflow-safe flag set.
Ex: returning the last line

echo -e "hello\nworld" | pz --end lines[-1]  # "world"

numbers – list of numbers so far processed

Not available with the --overflow-safe flag set.
Ex: show current average of the stream. More specifically, we output tuples: line count, current line, average.

$ echo -e "20\n40\n25\n28" | pz 's = count, s, sum(numbers)/count'
1, 20, 20.0
2, 40, 30.0
3, 25, 28.333333333333332
4, 28, 28.25

skip line

If set to True, current line will not be output. If set to False when using the -0 flag, the line will be output regardless.

i, S, L, D, C – other global variables

Some variables are initialized and ready to be used globally. They are common for all the lines.

  • i = 0
  • S = set()
  • L = list()
  • D = dict()
  • C = Counter()

It is true that using uppercase is not conforming the naming convention. However, in these tiny scripts the readability is the chief principle, every character counts.

Using a set S. In the example, we add every line to the set and end print it out in a sorted manner.

$ echo -e "2\n1\n2\n3\n1" | pz "S.add(s)" --end "sorted(S)"
1
2
3  

Using a list L. Append lines that contains a number bigger than one and finally, print their count. As only the final count matters, suppress the line output with the flag -0.

1: L.append(s)" --end "len(L)" -0 3 ">
$ echo -e "2\n1\n2\n3\n1" | pz "if n > 1: L.append(s)" --end "len(L)" -0
3  

Auto-import

  • You can always import libraries you need manually. (Put import statement into the command.)
  • Some libraries are ready to be used: re.* (match, search, findall), math.* (sqrt,...), defaultdict
  • Some others are auto-imported whenever its use has been detected. In such case, the line is reprocessed.
    • Functions: b64decode, b64encode, datetime, (requests).get, glob, iglob, Path, randint, sleep, time, ZipFile
    • Modules: base64, collections, csv, humanize, itertools, jsonpickle, pathlib, random, requests, time, webbrowser, zipfile

Caveat: When accessed first time, the auto-import makes the row reprocessed. It may influence your global variables. Use verbose output to see if something has been auto-imported.

$ echo -e "hey\nbuddy" | pz 'a+=1; sleep(1); b+=1; s = a,b ' --setup "a=0;b=0;" -v
Importing sleep from time
2, 1
3, 2

As seen, a was incremented 3× times and b on twice because we had to process the first line twice in order to auto-import sleep. In the first run, the processing raised an exception because sleep was not known. To prevent that, explicitly appending from time import sleep to the --setup flag would do.

Output

  • Explicit assignment: By default, we output the s.

    echo "5" | pz 's = len(s)' # 1
  • Single expression: If not set explicitly, we assign the expression to s automatically.

    echo "5" | pz 'len(s)'  # 1 (command internally changed to `s = len(s)`)
  • Tuple, generator: If s ends up as a tuple, its get joined by spaces.

    $ echo "5" | pz 's, len(s)'
    5, 1 

    Consider piping two lines 'hey' and 'buddy'. We return three elements, original text, reversed text and its length.

    $ echo -e "hey\nbuddy" | pz 's,s[::-1],len(s)' 
    hey, yeh, 3
    buddy, yddub, 5
  • List: When s ends up as a list, its elements are printed to independent lines.

    $ echo "5" | pz '[s, len(s)]'
    5
    1 
  • Regular match: All groups are treated as a tuple. If no group used, we print the entire matched string.

    # no group → print entire matched string
    echo "hello world" | pz 'search(r"\s.*", s)' # " world"
    
    # single matched group
    echo "hello world" | pz 'search(r"\s(.*)", s)' # "world"
    
    # matched groups treated as tuple
    echo "hello world" | pz 'search(r"(.*)\s(.*)", s)'  # "hello, world"
  • Callable: It gets called. Very useful when handling simple function – without the need of explicitly putting parenthesis to call the function, we can omit quoting in Bash (expression s.lower() would have had to be quoted.) Use the verbose flag -v to inspect the internal change of the command.

    # internally changed to `s = s.lower()`
    echo "HEllO" | pz s.lower  # "hello"
      
    # internally changed to `s = len(s)`
    echo "HEllO" | pz len  # "5"
    
    # internally changed to `s = base64.b64encode(s.encode('utf-8'))`
    echo "HEllO" | pz b64encode  # "SEVsbE8="
    
    # internally changed to `s = math.sqrt(n)`
    # and then to `s = round(n)`
    echo "25" | pz sqrt | pz round  # "5"
    
    # internally changed to `s = sum(numbers)`    
    echo -e "1\n2\n3\n4" | pz sum
    1
    3
    6
    10
    
    # internally changed to `' - '.join(lines)`      
    echo -e "1\n2\n3\n4" | pz  --end "' - '.join"
    1 - 2 - 3 - 4

    As you see in the examples, if TypeError raised, we try to reprocess the row while adding current line as the argument:

    • either its basic form s
    • the numbers if available
    • using its numeral representation n if available
    • encoded to bytes s.encode('utf-8')

    In the --end clause, we try furthermore the lines.

CLI flags

  • -v, --verbose: See what happens under the hood. Show automatic imports and internal command modification (attempts to make it callable and prepending s = if omitted).
    invalid syntax ( , line 1) on line: hello $ echo -e "hello" | pz 'sleep(1)' --verbose Importing sleep from time">
    $ echo -e "hello" | pz 'invalid command'
    Exception: <class 'SyntaxError'> invalid syntax (<string>, line 1) on line: hello
    $ echo -e "hello" | pz 'sleep(1)' --verbose
    Importing sleep from time
  • -q, --quiet: See errors and values only. Suppress command exceptions.
    echo -e "hello" | pz 'invalid command' --quiet # empty result

Command clauses

  • COMMAND: The main clause, any Python script executed on every line (multiple statements allowed)
  • -S COMMAND, --setup COMMAND: Any Python script, executed before processing. Useful for variable initializing. Ex: prepend line numbers by incrementing a variable count.
    $ echo -e "row\nanother row" | pz 'count+=1;s = f"{count}: {s}"'  --setup 'count=0'
    1: row
    2: another row
    
    # the same using globally available variable `count` instead of using `--setup` and the `--format` flag
    $ echo -e "row\nanother row" | pz -f '{count}: {s}'
  • -E COMMAND, --end COMMAND: Any Python script, executed after processing. Useful for the final output. The variable text is available by default here.
    $ echo -e "1\n2\n3\n4" | pz --end sum
    10
    $ echo -e "1\n2\n3\n4" | pz s --end sum
    1
    2
    3
    4
    10  
    $ echo -e "1\n2\n3\n4" | pz sum --end sum
    1
    3
    6
    10
    10
  • -F, --filter: Line is piped out unchanged, however only if evaluated to True. When piping in numbers to 5, we pass only such bigger than 3.
    3" --filter 4 5">
    $ echo -e "1\n2\n3\n4\n5" | pz "n > 3"  --filter
    4
    5
    The statement is equivalent to using skip (and not using --filter).
    3" 4 5">
    $ echo -e "1\n2\n3\n4\n5" | pz "skip = not n > 3"
    4
    5
    When not using filter, s evaluates to True / False. By default, False or empty values are not output.
    3" True True">
    $ echo -e "1\n2\n3\n4\n5" | pz "n > 3"   
    True
    True
  • -f, --format: Main and end clauses are considered f-strings. The clause is inserted in between three-apostrophes f'''COMMAND''' internally.

Input / output

  • -n NUM Process only such number of lines. Roughly equivalent to head -n.

  • -1 Process just the first line.

  • -0 Skip all lines output. (Useful in combination with --end.)

  • --empty Output even empty lines. (By default skipped.)
    Consider shortening the text by 3 last letters. First line hey disappears completely then.

    $ echo -e "hey\nbuddy" | pz 's[:-3]'
    bu

    Should we insist on displaying, we see an empty line now.

    $ echo -e "hey\nbuddy" | pz 's[:-3]' --empty
    
    bu
  • -g [NUM], --generate [NUM] Generate lines while ignoring the input pipe. Line will correspond to the iteration cycle count (unless having the --overflow-safe flag on while having an infinite generator – in that case, lines will equal to '1'). If NUM not specified, 5 lines will be produced by default. Putting NUM == 0 means an infinite generator. If no main clause set, the number is piped out.

    $ pz -g2
    1
    2
    $ pz 'i=i+5' -g -v
    Changing the main clause to: s = i=i+5
    Generating s = 1 .. 5
    5
    10
    15
    20
    25
  • --stderr Print clauses' output to the STDERR, while letting the original line piped to STDOUT intact. Useful for generating reports during a long operation. Take a look at the following example, every third line will make STDERR to receive a message.

    $ pz -g=9 s | pz "s = 'Processed next few lines' if count % 3 == 0 else None" --stderr 
    1
    2
    3
    Processed next few lines
    4
    5
    6
    Processed next few lines
    7
    8
    9
    Processed next few lines

    Demonstrate different pipes by writing STDOUT to a file and leaving STDERR in the terminal.

    /tmp/example Processed next few lines Processed next few lines Processed next few lines cat /tmp/example 1 2 3 ... ">
    $ pz -g=9 s | pz "s = 'Processed next few lines' if count % 3 == 0 else None" --stderr > /tmp/example
    Processed next few lines
    Processed next few lines
    Processed next few lines
    
    cat /tmp/example
    1
    2
    3
    ...  
  • --overflow-safe Prevent lines, numbers, text variables to be available. Useful when handling an infinite input.

    name 'text' is not defined in the --end clause # force to populate `text` echo -e "1\n2\n2\n3" | pz --end "len(text)" --overflow-safe --whole 7">
    # prevent `text` to be populated by default
    echo -e  "1\n2\n2\n3" | pz --end "len(text)" --overflow-safe
    Did you not forget to use --while to access `text`?
    Exception: 
         
           name 'text' is not defined in the --end clause
    
    # force to populate `text` 
    echo -e  "1\n2\n2\n3" | pz --end "len(text)" --overflow-safe --whole
    7
    
         

Regular expressions shortcuts

  • --search Equivalent to search(COMMAND, s)

    $ echo -e "hello world\nanother words" | pz --search ".*\s"
    hello
    another
  • --match Equivalent to match(COMMAND, s)

  • --findall Equivalent to findall(COMMAND, s)

  • --sub SUBSTITUTION Equivalent to sub(COMMAND, SUBSTITUTION, s)

    $ echo -e "hello world\nanother words" | pz ".*\s" --sub ":"
    :world
    :words

    Using groups

    $ echo -e "hello world\nanother words" | pz "(.*)\s" --sub "\1"
    helloworld
    anotherwords

Bash completion

  1. Run: apt-get install bash-completion jq
  2. Copy: extra/pz-autocompletion.bash to /etc/bash_completion.d/
  3. Restart terminal
Comments
  • MANIFEST.in → setup.py

    MANIFEST.in → setup.py

    Hello @thewchan , you've introduced MANIFEST.in file in #5 . I did some probe and it seems MANIFEST.in file is not very useful. As I tend to keep the number of files on the minimum, would you mind to refactor that to the setup.py (ex: https://stackoverflow.com/questions/9977889/how-to-include-license-file-in-setup-py-script )? Or is there any advantage in using MANIFEST.in?

    Thanks!

    opened by e3rd 10
  • config file/env variable to handle custom imports

    config file/env variable to handle custom imports

    Hi, thanks for pz, this is aswsome!

    I would find useful to have config file/env variable to handle imports users want to always have.

    i.e. :

    I like to use the rich package and currently I must use the --setup keyword

    echo 50 | pz \
        --setup 'from rich.progress import track;import time' \
        'for n in track(range(n)):  time.sleep(0.1)'
    

    I suggest to read an $XDG_CONFIG_HOME/pd/import.py file or and env variable export PZ_IMPORT='from rich.progress import track'to have my precious import always available.

    opened by kidpixo 7
  • Optional tabulate function for tuple mode?

    Optional tabulate function for tuple mode?

    Hello,

    this look exactly what I need and it is quite simple to use and quick to install (just wget). Anyway I was trying several options and

    s=1,2,3

    seems to be quite okay, but I think it should be improved with some option to call tabulate() at end or cmd option to make whole output table when string is tuple? I Understand that I can use formating, but for simple tables it could be be good to make some quick there automatically?

    opened by gitzdnex 4
  • Handle int excptions to zero

    Handle int excptions to zero

    echo -e 'a,1\nb,c' |pz 'int(s.split(",")[1])+2'
    Exception: <class 'ValueError'> invalid literal for int() with base 10: 'b' on line: a,b
    

    produces

    3
    Exception: <class 'ValueError'> invalid literal for int() with base 10: 'c' on line: b,c
    
    opened by hginzel 2
  • Consider undefined variable as string

    Consider undefined variable as string

    Could bare words became strings (optionally, -u, --unsafe / -x)? pz GNU+s </proc/version will be interpreted as GNU='GNU' instead of an exception Exception: <class 'NameError'> name 'GNU' is not defined on line: Linux… Shell eats quotes, it is necessary to double them: pz "'GNU'"+s </proc/version.

    opened by hginzel 1
  • Entry points missing

    Entry points missing

    I tried to install pz using pip3 on my computer:

    $ pip3 install --user pz
    Collecting pz
      Downloading pz-0.9.tar.gz (19 kB)
    Building wheels for collected packages: pz
      Building wheel for pz (setup.py) ... done
      Created wheel for pz: filename=pz-0.9-py3-none-any.whl size=12438 sha256=86f509791147f2b5e352fa63e3cbe3a37e4ff797cfe123be7cb760cac5ebdcc2
      Stored in directory: /Users/ocaletka/Library/Caches/pip/wheels/88/99/3f/fba1e5721b02aef3f0eea3150773500950d8db84de7d1974fc
    Successfully built pz
    Installing collected packages: pz
    Successfully installed pz-0.9
    
    $ pz
    zsh: command not found: pz
    

    Looking into setup.py I see no entry points definition so I don't think this is supposed to work.

    opened by oskar456 1
  • Delimit tuples by TABs instead of commas

    Delimit tuples by TABs instead of commas

    $ echo -e "hey\nbuddy" | pz 's,s[::-1],len(s)'
    hey	yeh	3
    buddy	yddub	5
    

    looks much better than

    $ echo -e "hey\nbuddy" | pz 's,s[::-1],len(s)'
    hey, yeh, 3
    buddy, yddub, 5
    
    opened by e3rd 0
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