Slice is a segment of a string. Selecting a slice is
similar to selecting a character. So for example:
>>> s = 'I will be back' >>> print s[0:6] I will >>> print s[6:14] be back |
The operator [n:m] returns the part of the string from
the n-th character to the m-th character, including the first but excluding the
last.
If you omit the first index, the slice starts at the
beginning of the string. If you omit the second index, the slice goes to the
end of the string.
>>> s[:6] 'I will' >>> s[6:] ' be back'
If the first index is greater than or equal to the
second index the result is an empty string, represented by two quotation marks:
>>> s[6:6] ''
Empty string contains no characters and has length 0,
but other than that it is the same as any other string.
Exercise – Given that the s = ‘I will be back’ what
does s[:] mean?
It means that it will print out the whole string form
start to an end.
>>> s[:] 'I will be back'
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