I learned Python by myself. I learned strings and learned python.

I learned Python by myself. I learned strings and learned python.

I. String

(1) strings are the most common data types in Python. We can use single quotes or double quotes to create strings.

Str = 'Hello world! '

Str = "Hi Hao are you? "

(2) Python access strings can be accessed using square brackets.

Str = "Hello World! "

Print str [1] # Output e

Print str [] # output ello

This is no different from the method in the list.

(3) modify the string

Str = "Hello World! "

Print str [: 6] + "laowang" # output Hello laowang

(4) Remove spaces and special symbols

S. strip (). lstrip (). rstrip (',')

(5) connection string

Str1 = "hello"

Str2 = "laowang"

Str3 = str1 + str2

Print str3 # "hellolaowang"

"+" Can connect two strings

(6) locate the character

Str1 = "laowang"

Str2 = "w"

P = str1.index (str2)

Print p #3

(7) compare strings

Str1 = "hello"

Str2 = "Hello"

Print cmp (str1, str2) # returns 1

(8), String Length

Str = "hello"

Print len (str) # Return 5

(9) reverse string

Str = "hello"

Print str [:-1] # "olleh"

(10), connection string

Str = ","

List = ["python", "java", "javascript"]

Print str. join (list) # ["python", "java", "javascript"]

(11) Intercepting strings

Str = '000000 ′

Print str [0: 3] # capture the first to third characters

Print str [:] # capture all characters in a string

Print str [6:] # truncates the seventh character to the end

Print str [:-3] # capture the first to last three characters

Print str [2] # truncate the third character

Print str [-1] # capture the first to last character

　　　 　Print str [:-1] # create a string in the opposite order of the original string

Print str [-3:-1] # extract the characters before the last and last digits

Print str [-3:] # truncate the last third digit to the end

Print str [:-5:-3] # reverse truncation, with 3 as the step, from right to left

A newbie posted this article. I hope you can understand it.