Learn the basic usage and simple format of the string, let's take a look at the operations of common string types.

1, the operator of the string

Positive strings, Python provides 3 basic operators, as shown in the following table:

Demonstration is as follows:

>>> x = 'one'
 >>> Y = 'string'
>>> x+y
 'A string'
>>> x*3
 'One one one'
 >>> s = 'a string'
>>> x in s
False
>>> y in s
True

2, string handler

The use of functions is convenient and fast, and Python has a lot of string handlers that use the string handle, which is commonly used:

Demonstration is as follows:

>>> s = 'atrie string'
 >>> LEN (S) #  , punctuation is a character
5

>>> a =23
>>> str(a)
'23'

>>> chr(1010)
'ϲ'
>>> ord('ϲ')
1010

>>> hex(123)
'0x7b'
>>> oct(123)
'0o173'

4, string processing method

Method is a proprietary noun in programming, belonging to object-oriented programming. The computer secondary level test does not involve the object-oriented content in Python, so we don't have to study, it will be useful.

The method is also a function, just the way the call mode is different. The function is used in the <function name> (parameter), the method is <A>. <Function name> (parameter) to call, and previously passed the object <A> as input.

The following is a common string processing method:

Demonstration is as follows:

>>> Str = 'Python string'

>>> str.lower()
 'python string'

 >>> 'Python string'.upper ()
 'Python string'

>>> str.split('t')
 ['Py', 'Hon string']

>>> str.count('Python')
1

>>> str.replace('on','eg')
 'Pytheg string'

 >>> Str.center (30, '+') # Set the width of 30, blank with '+' filled
 '++++++++++ Python string ++++++++'

 # String width is larger than Width, so the string width is displayed, and FillChar is missing the default space.
>>> str.center(2)
 'Python string'

 >>> '+'. Join ("python") # is very understandable, see the effect
'P+y+t+h+o+n'

 >> Str = '++ == Python's normal characters == ++'
>>> str.strip(' ')
 '++ == Python's normal characters == ++'