如何从 bash shell 内联执行 Python

有没有 Python 参数可以在不启动交互式解释器或读取文件的情况下从 shell 执行代码？类似于:

perl -e 'print "Hi"'

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最佳答案

This works:

python -c 'print("Hi")'
Hi

From the manual, man python:

   -c command
Specify  the command to execute (see next section).  This termi-
nates the option list (following options are passed as arguments
to the command).

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Another way is to use the e module

eg.

$ python -me 1 + 1
2

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Another way is to you use bash redirection:

python <<< 'print "Hi"'

And this works also with perl, ruby, and what not.

p.s.

To save quote ' and " for python code, we can build the block with EOF

c=`cat <<EOF
print(122)
EOF`
python -c "$c"

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A 'heredoc' can be used to directly feed a script into the python interpreter:

python <<HEREDOC
import sys
for p in sys.path:
print(p)
HEREDOC




/usr/lib64/python36.zip
/usr/lib64/python3.6
/usr/lib64/python3.6/lib-dynload
/home/username/.local/lib/python3.6/site-packages
/usr/local/lib/python3.6/site-packages
/usr/lib64/python3.6/site-packages
/usr/lib/python3.6/site-packages