If the following code equates to 'True':

'1234567' in '1234567:AMC'

Why won't the opposite also indicate 'True'? They both share the 1234567 character strings.

'1234567:AMC' in '1234567'

Is there a way this get this to say 'True' for the line of code above?

CodePudding user response：

The str type has a .find() method with can be used.

The method returns the starting position of the found string, or -1 if not found.

For example:

'1234567:AMC'.find('1234567')

Returns 0. Indicating the primary string contains the substring starting at index 0. If the substring was not found, -1 would be returned.

CodePudding user response：

To say the second expression true, I would add a not to flip it:

>>> '1234567:AMC' not in '1234567'
True

If you want to check if longer str starts with input str, I'd suggest str.startswith:

>>> '1234567:AMC'.startswith('1234567')
True

But for contains check, I believe you hit the nail on the head:

>>> '1234567' in '1234567:AMC'
True