py string str

1. str- escape character (/):

　　print('"I\'m fine",thank you!')

2. str- sections:

　　= str1 'HelloWorld'
　　Print (str1 [0: +. 1. 4])
　　# string from beginning to take full index 0
　　Print (str1 [0:])
　　# 0 starts from the default index
　　print (str1 [: 4 + 1 ])
　　# default starting from 0 to -1
　　Print (str1 [:])

　　# Take down the entire string
　　Print (str1 [:: -. 1])
　　# rowolleh
　　Print (str1 [-3 :: -. 1])

A summary:

'' '
STR [Start: end_not: STEP]
1. Start starting point (comprising);
2. end_not ending point (not included);
3. STEP increments, if it is positive, positive taken; if it is negative reverse (taken backwards)
4. If the step is not written, the default forward one by one to get the string.
'' '

3. split()

　　= STR 'Hello'
　　str2 = 'World'
　　# The divided character string: [ 'H', 'LLO']
　　Print (str.split ( 'E'))

4. join()

　　str3 = '123'
　　str4 = '_'
　　# 1-2-3
　　print(str4.join(str3))

　　str5 = ['123','456']
　　# 123-456
　　print(str4.join(str5))