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Super Kai (Kazuya Ito)
Super Kai (Kazuya Ito)

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String in Python (8)

#python #string #str #function

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*Memos:

split() can split a string from the left to the right as shown below:

*Memos:

  • The 1st argument is sep(Optional-Default:None-Type:str or NoneType): *Memos:
    • It's the delimiter of the one or more characters to delimit a string.
    • An empty string cannot be set.
  • The 2nd argument is maxsplit(Optional-Default:-1-Type:int): *Memos:
    • It decides how many splits are made.
    • If it's not set or -1, then all possible splits are made.
  • If sep is set, consecutive delimiters aren't grouped together and are deemed to delimit empty subsequences (for example, b'1,,2'.split(b',') returns [b'1', b'', b'2']). 
v = 'one two  three   four\nfive\tsix'
      # ↑   ↑↑     ↑↑↑
print(v)
# one two  three   four
# five    six

print(v.split())
print(v.split(sep=None, maxsplit=-1))
# ['one', 'two', 'three', 'four', 'five', 'six']

print(v.split(maxsplit=0))
# ['one two  three   four\nfive\tsix']

print(v.split(maxsplit=1))
# ['one', 'two  three   four\nfive\tsix']

print(v.split(maxsplit=2))
# ['one', 'two', 'three   four\nfive\tsix']

print(v.split(maxsplit=3))
# ['one', 'two', 'three', 'four\nfive\tsix']

print(v.split(maxsplit=4))
# ['one', 'two', 'three', 'four', 'five\tsix']

print(v.split(maxsplit=5))
# ['one', 'two', 'three', 'four', 'five', 'six']
                 # ↓
print(v.split(sep=' '))
# ['one', 'two', '', 'three', '', '', 'four\nfive\tsix']
                 # ↓↓
print(v.split(sep='  '))
# ['one two', 'three', ' four\nfive\tsix']
                 # ↓↓↓
print(v.split(sep='   '))
# ['one two  three', 'four\nfive\tsix']
                 # ↓↓↓↓
print(v.split(sep='    '))
# ['one two  three   four\nfive\tsix']

print(v.split(sep=''))
# ValueError: empty separator
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v = 'one-two--three---four-=*!five-=*!?six'
      # ↑   ↑↑     ↑↑↑    ↑↑↑↑    ↑↑↑↑↑
print(v)
# one-two--three---four-=*!five-=*!?six

print(v.split())
# ['one-two--three---four-=*!five-=*!?six']
                 # ↓
print(v.split(sep='-'))
# ['one', 'two', '', 'three', '', '', 'four', '=*!five', '=*!?six']
                 # ↓↓
print(v.split(sep='--'))
# ['one-two', 'three', '-four-=*!five-=*!?six']
                 # ↓↓↓
print(v.split(sep='---'))
# ['one-two--three', 'four-=*!five-=*!?six']
                 # ↓↓↓
print(v.split(sep='-=*'))
# ['one-two--three---four', '!five', '!?six']
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v = ''

print(v.split()) # []

print(v.split(sep=' '))
print(v.split(sep='-'))
# ['']
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rsplit() can split a string from the right to the left as shown below:

*Memos:

  • The 1st argument is sep(Optional-Default:None-Type:str or NoneType): *Memos:
    • It's the delimiter of the one or more characters to delimit a string.
    • An empty string cannot be set.
  • The 2nd argument is maxsplit(Optional-Default:-1-Type:int): *Memos:
    • It decides how many splits are made.
    • If it's not set or -1, then all possible splits are made.
  • If sep is set, consecutive delimiters aren't grouped together and are deemed to delimit empty subsequences (for example, b'1,,2'.split(b',') returns [b'1', b'', b'2']). 
v = 'one two  three   four\nfive\tsix'
      # ↑   ↑↑     ↑↑↑
print(v)
# one two  three   four
# five  six

print(v.rsplit())
print(v.rsplit(sep=None, maxsplit=-1))
# ['one', 'two', 'three', 'four', 'five', 'six']

print(v.rsplit(maxsplit=0))
# ['one two  three   four\nfive\tsix']

print(v.rsplit(maxsplit=1))
# ['one two  three   four\nfive', 'six']

print(v.rsplit(maxsplit=2))
# ['one two  three   four', 'five', 'six']

print(v.rsplit(maxsplit=3))
# ['one two  three', 'four', 'five', 'six']

print(v.rsplit(maxsplit=4))
# ['one two', 'three', 'four', 'five', 'six']

print(v.rsplit(maxsplit=5))
# ['one', 'two', 'three', 'four', 'five', 'six']
                  # ↓
print(v.rsplit(sep=' '))
# ['one', 'two', '', 'three', '', '', 'four\nfive\tsix']
                  # ↓↓
print(v.rsplit(sep='  '))
# ['one two', 'three ', 'four\nfive\tsix']
                  # ↓↓↓
print(v.rsplit(sep='   '))
# ['one two  three', 'four\nfive\tsix']
                  # ↓↓↓↓
print(v.rsplit(sep='    '))
# ['one two  three   four\nfive\tsix']

print(v.rsplit(sep=''))
# ValueError: empty separator
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v = 'one-two--three---four-=*!five-=*!?six'
      # ↑   ↑↑     ↑↑↑    ↑↑↑↑    ↑↑↑↑↑
print(v)
# one-two--three---four-=*!five-=*!?six

print(v.rsplit())
# ['one-two--three---four-=*!five-=*!?six']
                  # ↓
print(v.rsplit(sep='-'))
# ['one', 'two', '', 'three', '', '', 'four', '=*!five', '=*!?six']
                  # ↓↓
print(v.rsplit(sep='--'))
# ['one-two', 'three-', 'four-=*!five-=*!?six']
                  # ↓↓↓
print(v.rsplit(sep='---'))
# ['one-two--three', 'four-=*!five-=*!?six']
                  # ↓↓↓
print(v.rsplit(sep='-=*'))
# ['one-two--three---four', '!five', '!?six']
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v = ''

print(v.rsplit()) # []

print(v.rsplit(sep=' '))
print(v.rsplit(sep='-'))
# ['']
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