我的 python 代码没有按预期工作并返回错误的输出

Question

dacommandos = '!help'

actiontaken = input('what do you want to do: ')

if actiontaken == 'help':
    print(dacommandos)
else:
    print('no')

Whenever I type in 'help' it returns 'no', and whenever I type anything else it returns and error with input is not defined.

Answer 1

First you need to be running this in the interpreter. So go to a command line and type in python. Then you'll see >>> which means you are in the interpreter.

Then type each command as follows:

>>> dacommandos = '!help'
>>> actiontaken = input('what do you want to do: ')
what do you want to do: help
>>> if actiontaken == 'help':
...     print(dacommandos)
... else:
...     print('no')
... 
!help

Answer 2

Your system might be including the terminal return in the string. Try printing out actiontaken to see what's in it as well as the length of the string. Be careful on indentation using tabs vs spaces. You might end up testing the first four characters in actiontaken == 'help'.

Answer 3

dacommandos = '!help'

actiontaken = input('what do you want to do: ')

if actiontaken == 'help':
    print(dacommandos)
else:
    print('no')

Whenever I type in 'help' it returns 'no', and whenever I type anything else it returns and error with input is not defined.