python 基础系列08-内建函数

r囧r小猫 2023-07-06 06:30 5阅读 0赞

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#python 基础系列08-内建函数
    
    #引入sys库
    import sys
    import copy
    from functools import reduce
    
    if __name__ == '__main__':
        str = "Srtd13DDD"
    
        #字符串大小写转换,首字符大小写等等函数
        str.lower()
        str.upper()
        str.swapcase()
        str.title()
        str.capitalize()
    
        #搜索函数
        str.find('r')
        str.find('r',0,3)
    
        str.index()
        str.index('r',0,2)
    
        str.count('r')
    
        str.endswith('r')
    
        #字符串替换
        str.replace('r','r1')
        str.replace('r','r1',2) #替换几次
        str.lstrip() #去掉空白
        str.rstrip()#去掉空白
    
        #分割，组合
        str.split(':')
        new_str = str.split(':')
        #拼接成字符串
        new_str2 = '*'.join(new_str)
    
        #判断函数
        str.isdigit()
        str.islower()
        str.isupper()
        str.isspace() #判断是否是空字符串
    
    
        #列表内建函数
        mylist = [1,2,3]
        mylist.append(222)
        mylist.count()
        mylist.extend((1,2))
        mylist.insert(0,(111,22))
        mylist.pop(0)
        mylist.reverse() #反转
    
        #系统内建函数
        rs  = enumerate(mylist)
        for var in rs :
            print(var)
    
        len(mylist)
    
        max('a','b')
        #指定比较规则，内置函数
        max('aa1','bb2',key=lambda  x:x[1])
    
        rss2 = reversed('aafggngdd')
        for v in reversed('aafggngdd'):
            print(v)
    
    
        #简单排序
        sorted(mylist)
        mylist.reverse()
    
        # zip函数 ,一一对应上
        mylist2 = [1,2,3]
        mylist3 = ['a','b','c']
    
        for v1 in zip(mylist2,mylist3) :
            print(v1)
    
        #map函数 ,先定义一个函数
        map(func,mylist)
        for var3 in  map(func,mylist):
            print(var3)
    
        #reduce函数
        reduce(func2, mylist)  #需要导入 from functools import reduce
    
    def func(x):
        return  x*x
    
    def func2(x,y):
        return  x*y

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