python -c with a handy print function p
Project description
What is pythonp?
pythonp
is a simple utility script that helps you using python on the
command line. Basically, it's a python -c
command with a handy print
function p
. See examples below to see how convenient it can be.
How to install
You can install it via pip
python -m pip install pythonp
or you can simply download this repository and copy __main__.py
to
one of your $PATH
locations
cp pythonp/__main__.py ...../pythonp
Handy global variables defined
p
A handy print function with commandline usage in mind. It has the
similar interface to the built-in print
with a few exceptions.
- It specially handles a single iterable as an argument, in which case it prints as many times as the number of elements in the iterable. Giving extra positional arguments along with an iterable is not allowed.
- A newline character
'\n'
is removed automatically, if it exists at the end. If you hate this implicitness, you can always return toprint
.
lines
Standard input lines where each line ends with a newline
character. You can think of it as sys.stdin
except that it's
subscriptable and allows a one-time random access, which means you
can do something lines[3], lines[10:]
.
_lines
Lazy evaluted non-stream-like version of lines
.
Becuase it's a collections.abc.Sequence
, you can access its
lines multiple times, reverse it, do inclusion test on it,
and so forth. The lines are not prepared until you actually
use it to save up memory.
l
Each line of the sys.stdin
when -e
option is on. See the explanation
on -e
option below. Note that currently globals are shared among
all lines and there could be side effects. This is a inteded behavior
but can change in the future.
Features
-
The last expression is automatically printed with
p
function if your code dind't write anything tosys.stdout
and the last expression does not evalute toNone
. If you don't want this feature you can put something like;pass
or;None
in the end of your code. -
If
-e
option is given, your code can work on each linel
, not the entire lineslines
or_lines
. The nameslines
and_lines
will disappear and can not be used. -
Automatic importing is supported.
pythonp
automatically tries to import a name for you when it encounters an unseen one.
Examples
Print numbers
$ pythonp 'range(3)'
0
1
2
Print time
$ pythonp 'time.time()'
1546362172.5707405
Get files whose names are longer than 5
$ ls | pythonp -e "if len(l)>5: p(l)"
LICENSE
README.md
pythonp
setup.py
Randomly sample N files to investigate from a large number of files
ls | pythonp "random.sample(_lines, 3)"
item_1443
item_6360
item_7285
Concatenate filenames
$ ls | pythonp "','.join(l.strip() for l in lines if not 'bombs' in l)"
LICENSE,README.md,pythonp,setup.py,
Get the 4th column of the processs status
$ ps | tail -n+1 | pythonp -e "l.split()[3]"
/usr/local/bin/fish
-fish
python3
ssh
# or
$ ps | pythonp "lines[1:]" | pythonp -e "l.split()[3]" # using only pythonp
You can also do some crazy stuffs becuase pythonp can do anything that python can do
# If you have to solve a weird quiz
$ pythonp "now=datetime.datetime.now();(now.year+now.day)%10"
# Make at most 5 random names
$ pythonp "'\n'*5" | pythonp -e "''.join(random.sample(string.ascii_letters, 7))" | xargs touch
# If you want an one-liner crawler
$ cat urls.txt | pythonp -e 'requests.get(l.strip())' > output
Misc
- If you want a shorter name for
pythonp
you can do something like this.
mv $(which pythonp) $(dirname $(which pythonp))/p # rename pythonp to p
-
Both python2 and python3 are supported.
-
Refer to python official docs to learn useful string manipulating functions https://docs.python.org/3/library/string.html
-
It is a good idea to use generator expressions or list comprehensions with pythonp https://docs.python.org/3/howto/functional.html
-
If you want some other features, you are always welcome to make an issue, at the issue tab on the top menu.
Project details
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