1. string spans more than one line, with triple quotes (single or double quotation marks):
'''
first row
second line
The third row
'''
2. Index: String moment iteration. The first character is index 0, after each index plus one.
Python also supports negative index (negative index): from right to left can be used to find the index iterables of elements (must be a negative number). Index-1 can be found in the last element iteration object.
例： author = " Kafka"
print(author[1])
print(author[-2])
>>>> 'a'
>>>> 'k'
3. The strings are immutable: you want to modify the string, you must create a new string
4. string concatenation: using the addition operator, the two or more strings together to form a new string
5. Multiplication string:
例："abc" * 3
>>>> abcabcabc
6. Change Case:
1) upper () method, each character in the string to uppercase: Example: "Hello" .upper ()
2) lower () method, each character string to lowercase: Example: "Hello" .lower ()
3) capitalize () method: string to uppercase first letter: Example:. "! Hello world" capitalize ()
7. Format: can be used to create a string format, the method of the string "{}" is replaced with the string passed
例：“Hello {}”.format("world")
>>>> "Hello world!
8. The split split () method: for string is divided into two or more strings.
例："I am a student. My name is liuming .".split(".")
>>>> "I am a student" , "My name is liuming"
9. connection: the Join () method: the character can be added between each character string.
例： ” + “.join("abc")
>>>> 'a + b + c'
10. The space removal strip () method: removing a blank character string of the beginning and end.
例：s = " the "
print(s.strip())
>>>> 'the'
11. Replace: Replace () Method: The first argument is the string to be replaced, the second parameter is used to replace the string.
例：equ = "All animals are equal."
equ =equ.replace("a", "@")
print(equ)
>>>> All @nim@ls equ@l.
12. Find the index index () method: Get a character index of the first occurrence of the string. If not found, python will be reported abnormal
例："animals".index("m")
>>>> 3
13. keywords in, not in: Checks if a string is a string of zero returns True or False
例： "cat" in "cat in the hat"
>>>> True
14. The string escape "\": refers to have special significance in Python is a plus character symbol "\."
15. newline: \ n,
17. sliced (slicing):
Grammar sections: [iterable] [[start Index: end index]]
When the elements comprising slice start position, the end position of the index element is not included.