Collection of examples of Python built-in methods for manipulating strings

string_builtins.py

# Copyright (C) 2016 Martina Pugliese


def run_methods():

    print '\n'

    print '* Count occurrences of substring in string'
    print 'Martina'.count('art')
    print 'Martina'.count('a')
    print 'Martina'.count('a', 1, 3)       # in slice of str (giving start/end)
    print 'Martina'.count('a', 1)          # in slice of str (givin only start)

    print '* Find lowest index of substring in string'
    print 'Martina'.find('a')
    print 'Martina'.find('rt')
    print 'Martina'.find('a', 2, 10)       # start/end again
    print 'Martina'.find('y')              # -1 if not found

    print '* Does str start/end with substring?'
    print "I go".startswith('I'), "I go".startswith('I ')
    print 'Martina'.endswith('na')

    print '* Does str have some characteristics?'
    print 'Martina'.isupper(), 'MART'.isupper()
    print 'martina'.islower(), 'Ma'.islower()
    print '123'.isdigit(), '1a'.isdigit()
    print '1'.isalpha(), 'abc'.isalpha()
    print '1a'.isalnum(), '&'.isalnum()
    print ' '.isspace(), ' a'.isspace()
    print 'Martina'.istitle(), 'martina'.istitle(), \
          'mArtina'.istitle(), 'MARTINA'.istitle(), \
          'Martina Goes'.istitle(), 'Martina goes'.istitle()

    print '* Apply some transformations'
    strg = 'maRtina goes'                   # transformations return a copy
    print strg.lower(), strg.upper()
    print strg.title()
    print strg.swapcase()
    print strg

    print '* Stripping some chars'
    print 'x Martinax'.lstrip('x ')         # stripping from the left
    print 'xwMartinax'.rstrip('xw')         # stripping from the right
    print 'xwMartinax'.strip('xw')          # stripping both ways

    print '* Separating in parts at separator'
    print 'Martina'.partition('ar')

    print '* Replacing'
    print 'M art ina'.replace(' ', '')
    print 'M\nartina'.replace('\n', '$')
    print 'Martinaa'.replace('a', 'A', 2)  # only the first num occurrences

    print '* Splitting'
    print 'Martina goes to school'.split()
    print 'Martina goes  to school'.split()
    print 'Martina goes  to school'.split('  ')
    print 'Martina\nlikes\rschool.\r\nBla\nbla.'.splitlines()

    print '* Joining'
    print 'Martina'.join(['1', '2', '3'])
    print 'Martina'.join(['bla'])
    print 'Martina'.join('bla')

    print '* Formatting'
    print 'Martina {0} {1} and {2}'.format('eat', 'apple', 'sleep') # args
    print 'Martina {verb1} {obj} and {verb2}'\
          .format(verb1='eat', obj='apple', verb2='sleep')          # kwargs

if __name__ == '__main__':
    run_methods()