006 如何检测一个字符串是否可以转换为数字

检测字符串是否为数字

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s1 = '123456' s2 = '12.45' s3 = 'ab12' s4 = 'abc' s5 = 'ab_12' print(s1.isdigit()) print(s1.isdecimal()) print(s1.isnumeric()) print(s2.isdigit()) print(s2.isdecimal()) print(s2.isnumeric()) print(s3.isalnum()) print(s4.isalpha()) print(s5.isalnum())   True True True False False False True True False

 

如果将字符串转换为整数，如何做才安全

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s1 = '1234a' if s1.isdigit():     print(int(s1)) else:     print(s1, '不是数字，无法转换')   try:     print(int(s1)) except Exception as e:     print(e)     1234a 不是数字，无法转换 invalid literal for int() with base 10: '1234a'