如: >>> a = '520' >>> b = float(a) >>> b 520.0 >>> >>> a = 520 >>> b = float(a) >>> b 520.0 >>> 字符串str() 将一个数值或者任何其他类型转化为字符串如: >>> a = 5.99 >>> b = str(a) >>> b '5.99' #注意这里有引号,表示字符串 >>> >>> c = str(5e19)...
tuple:>>> a = (1,2,3,4)>>>a[0]1 >>> a[1]2 >>> a[0] = 10Traceback (most recent call last): File"<stdin>", line 1,in<module>TypeError:'tuple'object doesnotsupport item assignment deftype_tuple(x): x[0] = 10printxif__name__ =='__main__': a = (1,2,3,4) t...