python►a-basics

Python-a02-String

This article shows the examples of String in python

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# 1
   message1 = 'Hello World'
   print(message1)

# 2   
   message2 = "hello 'Jimmy'"
   print(message2)
   
# 3   
   message3 = 'Hello World'
   print(len(message3))
   
# 4   
   message4 = 'Hello World'
   print(message4[1])
   print(message4[-1])
   print(message4[0:5]) # first include, second not
   print(message4[:5]) # end to the 5
   print(message4[6:]) # start from the 6
   print(message4[11]) # error

# 5   
   message5 = 'Hello World'
   print(message5.lower())
   print(message5.upper())
   print(message5.count('l')) # count l's number in the message
   print(message5.find('World')) # return 6
   print(message5.find('Unknown')) # return -1

# 6   
   message6 = 'Hello World'
   # or by the same message6 = message6.replace('World', 'You')
   new_message6 = message6.replace('World', 'You')
   print(new_message6)
   
# 7   
   greeting='Hello'
   name='Bob'
   message7 = greeting + ', ' + name
   print(message7)  
   
   message8 = '{}, {}. Welcome!'.format(greeting, name)
   print(message8)
   
   message9 = f'{greeting}, {name}. Welcome!' # python >3.10
   print(message9)
   
   message10 = f'{greeting}, {name.upper()}. Welcome!' # python >3.10
   print(message10)
   
# 8
   print(help(str))   
   print(help(str.lower))