1. Definition of the string
You may be used "" double quotes may be used '' single quotes define a string, defined generally in double quotes.
2. The operation of the string
Determine the type:
Find and Replace
Case conversion:
Text alignment
NOTE: string.center (weight, str ) to align the filling str, similar to the other two methods, can be expanded.
Remove whitespace characters
Split and links
3. Slice the string
definition
String [Start Index: Index End: step] includes a front does not include back
1 str1 = "Hello,World" 2 # 截取索引2-5的字符 3 print(str1[2:6]) # llo, 4 # 从索引2开始,截取到最后 5 print(str1[2:]) # llo,World 6 # 从0开始截取到索引5 7 print(str1[:6]) # Hello, 8 # 从0开始截取到最后 9 print(str1[:]) # Hello,World 10 # 从零开始,步长为2,截取到最后(每两个截取一个) 11 print(str1[::2]) # HloWrd 12 # 从索引1开始,步长为2,截取到最后(从索引1开始,每隔一个取一个) 13 print(str1[1::2]) # el,ol 14 # 截取索引为-1的,截取最后一个字符 15 print(str1[-1]) # d 16 # 从索引2开始截取到倒数第二个(不包括倒数第一个) 17 print(str1[2:-1]) # llo,Worl 18 # 从倒数第二个开始,截取到最后 19 print(str1[-2:]) # ld 20 21 # 从最后一个开始,步长为-1(使用字符串切片,让字符串逆序) 22 print(str1[-1::-1])