Python string operation implementation code (interception/replacement/search/split)

Python intercepts strings and uses the variable [head subscript: tail subscript] to intercept the corresponding string. The subscript starts from 0 and can be a positive or negative number. The subscript can be empty to indicate fetching. to the beginning or the end.

# 例1：字符串截取
str = '12345678'
print str[0:1]
>> 1   # 输出str位置0开始到位置1以前的字符
print str[1:6]  
>> 23456   # 输出str位置1开始到位置6以前的字符
num = 18
str = '0000' + str(num) # 合并字符串
print str[-5:]  # 输出字符串右5位
>> 00018

Python uses variable .replace("replaced content", "replaced content" [, times]) to replace a string. The number of replacements can be empty, which means replacing everything. It should be noted that after using replace to replace a string, it is only a temporary variable and needs to be reassigned before it can be saved.

# 例2：字符串替换
str = 'akakak'
str = str.replace('k',' 8') # 将字符串里的k全部替换为8
print str
>> 'a8a8a8'  # 输出结果

Python uses the variable .find("what to find" [, start position, end position]) to find a string. The start position and end position represent the range to be found. If it is empty, it means to find all . After the search is found, the position will be returned. The position is calculated from 0, and -1 will be returned every time it is found.

# 例3：字符串查找
str = 'a,hello'
print str.find('hello') # 在字符串str里查找字符串hello
>> 2   # 输出结果

Python splits a string using the variable .split("split mark" [number of splits]). The number of splits represents the maximum number of splits. If it is empty, all will be split.

Example 4: Character segmentation

str = 'a,b,c,d'
strlist = str.split(',') # 用逗号分割str字符串，并保存到列表
for value in strlist: # 循环输出列表值
    print value
>> a   # 输出结果
>> b
>> c
>> d

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