如果 bash 中的某些语句为真，则执行 python 代码

Question

I have the following code where if a certain condition is true i try to execute a python code inside a shell script. The issue is i keep getting an IndentationError: unexpected indent and i am not sure why because this indention works fine when i execute the python code outside of the if statement.

if [ ! -z "$INSTANCE_ID" ]
then
      python -c \
      """
      from mydbmodule import db
      update_string = \
      'Update release_status SET release_deployed_at = NOW() \
      where release_deployed_at is null'

      db.execute(db.get_environment(), update_string)
      """
fi

Answer 1

This works:

if true; then
    python -c \
"
print ('test message')
"
fi

So does this:

if true; then
    python -c "
print ('test message')
"
fi

this raises an indentation error:

if true; then
    python -c \
"
    print ('test message')
"
fi

because the string Python gets is indented while it shouldn't be.

As for """ , in the shell it's pretty much the same as just one quote: """foo""" has three quoted strings, "" , "foo" , and "" . The first and third are just empty and don't do anything.