start[, end]]) -> int 300 301 Return the highest index in S where substring sub is found, 302 such that sub is contained within S[start:end]. Optional
1、字符串转换成时间戳 2、 日期转换成时间戳
【1】整数类型 整数类型(int)表示整数 整数类型可以参与各种数学运算 #类似年龄,一个个数字等age =18num1 =1num2 =2num3 =3#查看变量值print(age,num1,num2,num3)#18 1 2 3#查看数据类型print(type(age),type(num1),type(num2),type(num3))#<class 'int'> <class 'int'> <class 'int'> <...
int .count(sub[, start[, end]]返回子字符串sub in不重叠出现的次数 字符串(开始:结束)。可选参数start和end是用切片表示法解释。 """ return 0 def encode(self, *args, **kwargs): # real signature unknown """ Encode the string using the codec registered for encoding. encoding The encoding ...
) S.find(sub [,start [,end]]) -> int Return the lowest index in S where substring sub is found, such that sub is contained within S[start:end]. Optional arguments start and end are interpreted as in slice notation. Return -1 on failure. In [102]: s1.find("i") #元素第一次...
python 世界里,一切皆为对象(object),任何变量都是对象的引用。因此不用担心 Python 有类似于 C/C++ 中指针的复杂问题。以不可变数据类型中的整数(int)为例: 随便选取一个整数,例如 18 ,在 python 中 id(18) 来获得 18 在内存中的地址。 代码语言:javascript ...
space) """ return "" def count(self, sub, start=None, end=None): # real signature unknown; restored from __doc__ """ 从一个范围内的统计某str出现次数 S.count(sub[, start[, end]]) -> int Return the number of non-overlapping occurrences of substring sub in string S[start:end]....
| Return S centered in a string of length width. Padding is | done using the specified fill character (default is a space) | | count(...) | S.count(sub[, start[, end]]) -> int | | Return the number of non-overlapping occurrences of substring sub in ...
""" pass def count(self, sub, start=None, end=None): # real signature unknown; restored from __doc__ """ S.count(sub[, start[, end]]) -> int .count(sub[, start[, end]]返回子字符串sub in不重叠出现的次数 字符串(开始:结束)。可选参数start和end是用切片表示法解释。 """ return...
1、整数(int) 1)基本数据类型提供了许多内部调用方法,如__add__,其效果和加法一样,即整数在做加法时,会内部调用__add__方法来完成。带下划线的方法用的少,所以其带下划线方法可以忽略。 2、str类型 1)下面列出部分API解释。 str.capitalize() Return a copy of the string with its first character capitali...