学习Python第八天

Posted 2020-10-15

#!/usr/bin/env python
# -*- coding:utf-8 -*-
# def f1(x):
#     return x>22
# # ret = filter(f1,[11,22,33,44])
# ret = filter(lambda x:x>22,[11,22,33,44])
# for i in ret:
#     print(i)

# map
# def f1(x):
#     return x + 100
# ret = map(f1, [1, 2, 3, 4])
# print(ret)
# for i in ret:
#     print(i)
# print(‘###################‘)
# ret = map(lambda x: x + 100, [1, 2, 3, 4])
# for i in ret:
#     print(i)

# dic = {
#     ‘ff0‘:1
# }
#
# ret = hash(‘ff0‘)
# print(ret)
#
# li = [11,22]
# #判断某个对象是否是某个类创建的
# r = isinstance(li,list)
# print(r)
#
# a = range(10)
# for i in a:
#     print(i)

# obj = iter([11,22,33,44])
# ret = next(obj)
# ret2= next(obj)
# print(ret)
# print(ret2)

# li = [11,22,12,323,132]
# r = max(li)
# print(r)
# r = min(li)
# print(r)

# i = pow(2,10,10) #基数，次方，取余
# print(i)
# 四舍五入
# r = round(3.3)
# print(r)

# li = [11,22,33,44]
# # for i in li:
# #     print(i)
# li2 = [‘a‘,‘b‘,‘c‘,‘d‘,‘f‘]
# ret = zip(li,li2)
# for i in ret:
#     print(i)

# 数字转换成字母：chr（数字）
# i = chr(65)
# print(i)

# import random
# temp = ‘‘
# for i in range(6):
#     num1 = random.randrange(0,4)
#     if num1 == 3 or num1 == 1:
#         num3 = random.randrange(0,10)
#         temp +=str(num3)
#     else:
#         num = random.randrange(65, 91)
#         c = chr(num)
#         temp += c
# print(temp)

# li = [1,3,441,11,22,32,2]
# a = sorted(li)
# print(a)
# li=[‘b‘,‘a‘,‘ac‘]
# a = sorted(li)
# print(a)

# 1，打开文件 2、操作文件 3、关闭文件
# open(文件名/路径，模式（只读）（只写）等，编码)   默认是只读模式 ‘r‘

# f = open(‘../test‘,‘r‘)

# 只读
# data = f.read()

# 只写,并清空原文件里的内容，如果没有该文件则创建，w
# f = open(‘../test‘,‘w‘)
# f.write(‘123‘)
# print(f)

# 只写模式【不可读，不存在则创建，存在则报错】 x
# f = open(‘D:/TEST.txt‘,‘x‘)
# f.write(‘111‘)
# print(f)

# 追加模式，不可读，不存在则创建 a
# f = open(‘../test‘,‘a‘)
# f.write(‘123‘)
# f.close()

# 字节方式打开 只读，rb
# f = open(‘../test1‘,‘rb‘)
# data = f.read()
# print(type(data))
# print(data)
# f.close()

# f = open(‘../test‘,‘r‘,encoding=‘utf-8‘)
# data = f.read()
# f.close()
# print(data)

# # 1,只读，rb
# f = open(‘../test‘,‘rb‘)
# data = f.read()
# f.close()
# print(data)

# r+
# f = open(‘test‘,‘r+‘,encoding=‘utf-8‘)
# print(f.tell()) #获取当前指针
# data = f.read(3)
# print(f.tell()) #获取当前指针
# print(type(data),data)
# f.write(‘~~~fdafda‘)
# f.seek(0)#让指正回到起始位置
# data = f.read()
# print(type(data),data)
# f.close()

# w+ 先清空，重写之后才可以读
# f = open(‘test‘, ‘w+‘, encoding=‘utf-8‘)
# f.write(‘fffff!!!‘)
# f.seek(0)
# data = f.read()
# print(data)
# f.close()

# x+ 如果文件存在就报错

# a+ 打开的同时，指针已经到最后
# f = open(‘ha‘, ‘a+‘, encoding=‘utf-8‘)
# f.seek(0)
# data = f.read()
# print(data)
# f.close()

# f.tell() 获取指针的位置
# f.seek(num) 调整指针的位置
# f.write() 写内容
# f.read() 读取内容

# f = open(‘ha‘,‘r+‘,encoding=‘utf-8‘)
# temp = f.readline() #只读取一行
# f.flush()
# #依赖于指针
# f.truncate()
# f.write(‘ffff‘)
# print(temp)
#
# f.close()

# f = open(‘ha‘,‘r‘,encoding=‘utf-8‘)
# for line in f:
#     print(line)
# f.readline()

# f = open(‘ha‘,‘r‘,encoding=‘utf-8‘)
# d = open(‘test‘,‘w‘)
# for line in f:
#     d.write(line)
# f.close()
# d.close()

# def f3(arg):
#     print(‘aaa‘)
# def x():
#     print(‘bbbb‘)
# f3(x)

# arg =>代指函数，arg()执行函数
# arg =>arg是变量
# result = []
# def MyFilter(func,seq):
#     for i in seq:
#         e = func(i)
#         if e:
#             result.append(i)
#     return result
# def f1(x):
#     if x>22:
#         return True
#     else:
#         return False
#
# a = MyFilter(f1,[11,22,33,44,55])
# print(a)
# res = []
# li = [11, 22, 33, 44, 55]
#
#
# def x(arg):
#     return arg + 100
#
#
# def MyMap(fun,arg):
#     for i in arg:
#         ret = fun(i)
#         res.append(ret)
#     return res
# a = MyMap(x,li)
# print(a)