Page 233 - Robotics and AI class 10
P. 233

find(str,star t,  It  returns  the  index  of  the  first  >>> S="Hello, how are you?"
             end)             occurrence of a substring inside  a  >>> S. find("el")
                              string  if it is found.  If not  found,  it
                              returns -1.                         1
                                                                  >>> S.find(El")
                              Syntax is:
                                                                  -1
                              String.find(Substring,Start,
                                                                  >>> S.find(how')
                              End+1)
                                                                  7
                              Where Start and End are optional. If
                              not given then the searching starts   >>> S.find('How')
                              from index 0 to index last.         -1
                                                                  >>> S.find('o',5,10)
                                                                  8
             islower()        It returns True if the string contains  >>> S1="Class10B"

                              at least one lowercase letter and no  >>> S1.islower()
                              uppercase at all.
                                                                  False
                                                                  >>> 'hello'.islower()
                                                                  True
             isupper()        It returns True if the string contains   >>> S2="WORLD"
                              at least one uppercase letter and no     >>> S2.isupper()
                              lowercase at all.
                                                                  True
                                                                  >>> S1="Class10B"

                                                                  >>> S1.isupper()
                                                                  False
             isalpha()        It returns True if the string contains   >>> S1="Class10B"
                              only alphabets                      >>> S1.isalpha()


                                                                  False
                                                                  >>> S2="WORLD"
                                                                  >>> S2.isalpha()
                                                                  True
             isalnum()        It returns True if the string contains   >>> S1="Class10B"
                              only   alphanumeric(alphabets   or  >>> S1.isalnum()
                              digits)
                                                                  True
                                                                  >>> S2="Class10-B"

                                                                  >>> S2.isalnum()
                                                                  False
             isdigit()        It returns True if the string contains   >>> S1="Class10B"
                              only digits                         >>> S1.isdigit()


                                                                  False
                                                                  >>> S3="123"
                                                                  >>> S3.isdigit()
                                                                  True

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