Many online python examples show interactive python sessions with normal leading ">>>" and "..." characters before each line.
Often, there's no way to copy this code without also getting these prefixes.
In these cases, if I want to re-paste this code into my own python interpreter after copying, I have to do some work to first strip off those prefixes.
Does anyone know of a way to get python or iPython (or any other python interpreter) to automatically ignore leading ">>>" and "..." characters on lines that are pasted in?
Example:
>>> if True:
... print("x")
...
You just need to either switch off autoindent to include >>> and ... in a multiline paste:
In [14]: %autoindent
Automatic indentation is: OFF
In [15]: >>> for i in range(10):
....: ... pass
....:
In [16]: >>> for i in range(10):
...: ... pass
...: ...
In [17]: >>> for i in range(10):
...: ... pass
...: ...
In [18]: %autoindent
Automatic indentation is: ON
In [19]: >>> for i in range(10):
....: ... pass
....:
File "<ipython-input-17-5a70fbf9a5a4>", line 2
... pass
^
SyntaxError: invalid syntax
Or don't copy the >>> and it will work fine:
In [20]: %autoindent
Automatic indentation is: OFF
In [20]: for i in range(10):
....: ... pass
....:
IPython will do this for you automatically.
In [5]: >>> print("hello")
hello
In [10]: >>> print(
....: ... "hello"
....: )
hello
Not quite the same as pasting into the shell, but the doctest module can be useful. It scans a python module or regular text file looking for interactive script fragments and then runs them. Its primary use case is to blend documentation and unit test. Suppose you have a tutorial such as
This is some code to demonstrate the power of the `if`
statement.
>>> if True:
... print("x")
...
x
Remember, each `if` increases entropy in the universe,
so use with care.
>>> if False:
... print("y")
...
Save it to a file and then run doctest
$ python -m doctest -v k.txt
Trying:
if True:
print("x")
Expecting:
x
ok
Trying:
if False:
print("y")
Expecting nothing
ok
1 items passed all tests:
2 tests in k.txt
2 tests in 1 items.
2 passed and 0 failed.
Test passed.
doctest runs the script fragments and compares it to the expected output.
UPDATE
Here's a script that will take what's in the clipboard and paste back the python script fragments. Copy your example, run this script and then paste into the shell.
#!/usr/bin/env python3
import os
import pyperclip
pyperclip.copy(os.linesep.join(line[4:]
for line in pyperclip.paste().split(os.linesep)
if line[:4] in ('>>> ', '... ')))
