String, dictionary manipulation methods in Python

One, the string

In Python, a string is an important data type. Other data types are:

1. The number-number-------- int, long, float, complex
2. String-string-------- "Use quotation marks" are quoted as strings.
3. Tuple-tuple------------elements enclosed in parentheses, separated by commas
   The above three is the immutable object in Python, the amount that cannot be changed after creation--the value that the variable points to memory cannot be changed, when a variable is changed, because its value cannot be changed, it is equivalent to copy the original value and then change, this will open a new address, The variable points to this new address again.
   
4. List-list--------------- [1, 2, 3] [' A ', ' B ', ' C '] brackets, the elements inside are separated by commas
5. Dictionary-dict-------------- {key1:value1, key2:value2} use curly braces + key-value method definitions, use between key values: colon, separate key pair values using commas
6. Boolean-bool--------- true and False
   4, 5, 6 are mutable objects, meaning that the object points to the memory value can be changed.

1.1 Method of String

2. str.capitalize()Will capitalize the first letter
4. str.count(x, start=None, end=None)Counts the number of characters x specified in str, start and end as start and ending bits
6. str.center(num, [指定字符])The STR string is centered in the num-length character and the second parameter is the padding character if the Str is not long enough. "{0:[填充字符]^[长度]}".format(str)the same effect
8. str.endswith("tr")Determines if STR is a specified parameter, and here is the end of "TR", which returns True no false
10. str.find([指定字符])Find the starting index of the parameter character in Str
12. str.isalnum()Whether STR is an Arabic numeral, a character, is a return true
14. str.isalpha()Is it pure English?
16. str.isdecimal()is a decimal number
18. str.isdigit()is an integer
20. str.isidentifier()is a valid identifier (variable name)
22. str.islower()Whether the string is all lowercase
24. str.lower()Lowercase the string
26. str.isupper()Whether the string is uppercase
28. str.upper()Capitalize a string
30. ‘[分隔符]‘.join([iterable])"+".join([‘1‘, ‘2‘, ‘3‘])the Join method argument as the result of the ' 1+2+3 ' delimiter is a recyclable object
32. str.ljust(num, ‘[填充符]‘)Extended str length to num, not enough position to fill from right to left with padding
34. str.split(sep=None)Splits a character by the Sep parameter and returns the split element as a list
36. str.strip(chars=None)important The default is to remove space, \ n, \ t, or remove the specified parameter number from the string header and tail

>>> str_test = ‘\n/home/user/lina  

String, dictionary manipulation methods in Python