Question

Consider the string str="Green Revolution".write statements in python to implement the following:
To display the last four characters.
To display the starting index for the substring 'vo.'
To check whether the string contains 'vol' or not
To repeat the string 3times

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Answer 1

str = "Green Revolution"

a) To display the last four characters.

>>>  str[-4:]

'tion'

• This can be done using string slicing, which is the act of extracting a substring from a given string. It can be used when one is aware of the index values of each character.

b) To display the starting index for the substring 'vo'.

>>> str.index("vo")

8

• The index() method is used to check whether a given element is present in a string/list or not. If it is, it displays the index value of the particular element.

c) To check whether the string contains 'vol' or not.

>>> "vol" in str

True

• This is done using a membership operator [in]. It is used for checking whether an element is present in a given string/list/dictionary.

d) To repeat the string 3 times.

>>> str*3

'Green RevolutionGreen RevolutionGreen Revolution'