python如何判断输入是字符串还是数字 python3.2.3怎么判断输入的字符串是数字还是字母
python\u5982\u4f55\u5224\u65ad\u8f93\u5165\u662f\u5b57\u7b26\u4e32\u8fd8\u662f\u6570\u5b57\u8bf4\u660e\uff1a
python\u8f93\u5165\u7684\u5185\u5bb9\u5728\u5185\u90e8\u5168\u90e8\u4e3a\u5b57\u7b26\u4e32\uff0c\u6240\u4ee5\u8981\u5224\u65ad\u8fd9\u4e2a\u5b57\u7b26\u4e32\u662f\u5426\u4e3a\u4e00\u4e2a\u6570\u5b57\u3002\u5927\u591a\u6cd5\u5185\u90e8\u51fd\u6570\u5e76\u4e0d\u80fd\u5bf9\u5404\u79cd\u5f62\u5f0f\u7684\u6570\u636e\u505a\u51fa\u6b63\u786e\u5224\u65ad\uff0c\u4f8b\u5982isdigit()\u51fd\u6570\u53ea\u80fd\u5224\u65ad\u5b57\u7b26\u4e32\u662f\u5426\u4e3a\u7eaf\u6570\u636e\u7ec4\u6210\u5bf9\u4e8e\u8d1f\u6570\u5219\u65e0\u6548\u4e86\u3002\u6240\u4ee5\u53ef\u4ee5\u4f7f\u7528float()\u6765\u68c0\u6d4b\uff0c\u5bf9\u5404\u79cd\u6570\u5b57\u7684\u8868\u793a\u65b9\u6cd5\u90fd\u6709\u6548\u679c\u3002
\u65b9\u6cd5\u4ee3\u7801\uff1a
#\u5b9a\u4e49\u51fd\u6570
def isnub(s):
try:
nb = float(s) #\u5c06\u5b57\u7b26\u4e32\u8f6c\u6362\u6210\u6570\u5b57\u6210\u529f\u5219\u8fd4\u56deTrue
return True
except ValueError as e:
return False #\u5982\u679c\u51fa\u73b0\u5f02\u5e38\u5219\u8fd4\u56deFalse
#\u6d4b\u8bd5
print(isnub('123'))
print(isnub('abc'))
print(isnub('123.123'))
print(isnub('-123.123'))
print(isnub('-1.609E-19'))
\u6d4b\u8bd5\u7ed3\u679c\u5982\u4e0b\uff1a
True
False
True
True
True
1\u3001python\u4e2d\u5b57\u7b26\u4e32\u65b9\u6cd5str.isalnum\u7528\u6765\u5224\u65ad\u5b57\u7b26\u4e32\u662f\u5426\u7531\u6570\u5b57\u6216\u5b57\u6bcd\u7ec4\u6210\u3002\u5982\u679c\u5b57\u7b26\u4e32\u7531\u7eaf\u6570\u5b57\u7ec4\u6210\uff0c\u8fd4\u56de\u7ed3\u679cTrue\u3002
2\u3001\u5982\u679c\u5b57\u7b26\u4e32\u7531\u7eaf\u5b57\u6bcd\u7ec4\u6210\uff0c\u8fd4\u56de\u7ed3\u679cTrue\u3002
3\u3001\u5982\u679c\u5b57\u7b26\u4e32\u7531\u5b57\u6bcd+\u6570\u5b57\u7ec4\u6210\uff0c\u8fd4\u56de\u7ed3\u679cTrue\u3002\uff08\u4e0d\u533a\u5206\u5b57\u6bcd\u5927\u5c0f\u5199\uff09
4\u3001\u5982\u679c\u5b57\u7b26\u4e32\u9664\u4e86\u5b57\u6bcd\u8ddf\u6570\u5b57\u5916\uff0c\u542b\u6709\u522b\u7684\u5b57\u7b26\uff0c\u8fd4\u56de\u7ed3\u679cFalse\u3002
使用class()函数
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