string转int，使用这些技巧轻松搞定

1. 使用int()函数将字符串转换为整数

str_number = "123"
int_number = int(str_number)
print(int_number)

2. 使用float()函数将字符串转换为浮点数

str_number = "123.45"
float_number = float(str_number)
print(float_number)

3. 使用算术运算符将字符串转换为整数

str_number = "123"
int_number = 0
for char in str_number:
    int_number = int_number * 10 + int(char)
print(int_number)

4. 使用正则表达式提取数字并转换为整数

import re
str_number = "123abc"
int_number = int(re.search(r'\d+', str_number).group())
print(int_number)