python怎么定义了数字 python中定义一长串数字,怎样隔一位取一个数字
Python\u5982\u4f55\u89c4\u5b9a\u5bf9\u65b9\u8f93\u5165\u7684\u6570\u5b57\u5fc5\u987b\u662f\u6574\u6570\uff1f1\u3001\u53ef\u4ee5\u4f7f\u7528\u5b57\u7b26\u4e32str\u7684isdigit\u65b9\u6cd5\u5224\u65ad\u5b57\u7b26\u4e32\u662f\u5426\u662f\u4e00\u4e2a\u4ec5\u6709\u6570\u5b57\u7ec4\u6210\uff0c\u4e5f\u5c31\u662f\u6574\u6570\u3002\u5982\u679c\u662f\u6574\u6570\u9000\u51fawhile\u5faa\u73af\uff0c\u5426\u5219\u7ee7\u7eed\u8bf7\u6c42\u8f93\u5165\u3002
while True:
x = input('Input an integer: ')
if x.isdigit():
break
else:
print 'Please input an *integer*'
2\u3001\u4e5f\u53ef\u4ee5\u4f7f\u7528try-except\u8bed\u53e5\u3002\u5982\u679c\u8f93\u5165\u7684\u5b57\u7b26\u4e32\u662f\u6574\u6570\uff0c\u90a3\u4e48\u5b83\u53ef\u4ee5\u7528\u7528int()\u51fd\u6570\uff0c\u8f6c\u6362\u4e3aint\u7c7b\u5e76\u9000\u51fa\u5faa\u73af\uff0c\u5426\u5219\u4f1a\u51fa\u73b0ValueError\uff0c\u53ef\u4ee5\u4f7f\u7528try-except\u8bed\u53e5\u6355\u83b7ValueError\uff0c\u7136\u540e\u7ee7\u7eed\u8bf7\u6c42\u8f93\u5165\u3002
while True:
try:
x = input('Input an integer: ')
x = int(x)
break
except ValueError:
print 'Please input an *integer*'
\u6269\u5c55\u8d44\u6599
Python \u51fd\u6570
\u51fd\u6570\u4ee3\u7801\u5757\u4ee5 def \u5173\u952e\u8bcd\u5f00\u5934\uff0c\u540e\u63a5\u51fd\u6570\u6807\u8bc6\u7b26\u540d\u79f0\u548c\u5706\u62ec\u53f7()\u3002
\u4efb\u4f55\u4f20\u5165\u53c2\u6570\u548c\u81ea\u53d8\u91cf\u5fc5\u987b\u653e\u5728\u5706\u62ec\u53f7\u4e2d\u95f4\u3002\u5706\u62ec\u53f7\u4e4b\u95f4\u53ef\u4ee5\u7528\u4e8e\u5b9a\u4e49\u53c2\u6570\u3002
\u51fd\u6570\u7684\u7b2c\u4e00\u884c\u8bed\u53e5\u53ef\u4ee5\u9009\u62e9\u6027\u5730\u4f7f\u7528\u6587\u6863\u5b57\u7b26\u4e32\u2014\u7528\u4e8e\u5b58\u653e\u51fd\u6570\u8bf4\u660e\u3002
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return [\u8868\u8fbe\u5f0f] \u7ed3\u675f\u51fd\u6570\uff0c\u9009\u62e9\u6027\u5730\u8fd4\u56de\u4e00\u4e2a\u503c\u7ed9\u8c03\u7528\u65b9\u3002\u4e0d\u5e26\u8868\u8fbe\u5f0f\u7684return\u76f8\u5f53\u4e8e\u8fd4\u56de None\u3002
\u8fd9\u662f\u4e00\u4e2a\u666e\u904d\u7684\u6570\u5b57\u8f93\u5165\u95ee\u9898\u3002
Excel\u4e2d\u9ed8\u8ba4\u7684\u6570\u5b57\u683c\u5f0f\u662f\u201c\u5e38\u89c4\u201d\uff0c\u6700\u591a\u53ef\u4ee5\u663e\u793a11\u4f4d\u6709\u6548\u7684\u6570\u5b57\uff0c\u8d85\u8fc711\u4f4d\u5c31\u4ee5\u79d1\u5b66\u8bb0\u6570\u5f62\u5f0f\u8868\u8fbe\u3002
\u5f53\u5355\u5143\u683c\u683c\u5f0f\u8bbe\u7f6e\u4e3a\u201c\u6570\u503c\u201d\u3001\u5c0f\u6570\u70b9\u4f4d\u6570\u4e3a0\u65f6\uff0c\u6700\u591a\u4e5f\u53ea\u80fd\u5b8c\u5168\u663e\u793a15\u4f4d\uff0c\u591a\u4f5915\u4f4d\u7684\u6570\u5b57\uff0c\u4ece16\u4f4d\u8d77\u663e\u793a\u4e3a0\u3002
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var = 5 默认定义的是整数型的
var1=5.0 默认定义的是浮点数型的
直接定义,比如a=123,类型转换可以用int(x)
int 整数型数字
float 浮点型数字
没有严格类型,赋予什么是什么类型
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