python 基础练习

f = 3
d = 6

# print(f>5 or d>5)
# print(not (d>5))
# (f>5) and print(111)

#输出
# print( '我是好人%s' % ('哈哈'))
# name = input('请输入名字')
# print( 'tama d huaile %s' % (name))
# if 6>7:
#     print(222)
# else:
#     print(555)
# a = range(1,10)
# for i in a:
#     print(i)
# list 添加
# a = [1,2,4,5]
# a.append(6)
# a.insert(2,66) #插入到指定位置
# print(a)

# list 删除
# a = [1,2,4,5]
# a.pop()
# del(a[2])
# a.remove(2)
# print(a)

# for循环拿到index
# list = ['a', 'b', 'c']
#
# for index, v in enumerate(list):
#     print(index)
#     print(v)
# 字典查询
# b = {'aaa':20,'fff':90}
# print(b.get('aaa'))
# print(b['aaa'])

# 字典添加
# b = {'aaa':20,'fff':90}
# b['hhh'] =202
# print(b)

# 字典删除
# b = {'aaa':20,'fff':90}
# # del b #全部删除
# del b['aaa']  #删除某一个
# b.clear()  #删除所有元素 但保留字典  只是为空而已
# print(b)

# 字典遍历


# b = {'aaa':20,'fff':90}
#拿到键
# for k in b.keys():
#     print(k)
#拿到值
# for v in b.values():
#     print(v)
#拿到键和值
# for k,v in b.items():
#     print(k,v)
#拿到元素
# for item in b.items():
#     print(item[0])
#     print(item[1])


#局部变量
# def getNum(n = '扯淡'):
#     a = 2
#     print(a)
# getNum()
# print(a)

#全局变量
# a = 1
# print(a)
# def getNum():
#     print(a)
# getNum()

#文件操作
# f = open('test.txt','w')  # write写  创建一个文件
# f.write('hell word')    #写入文件内容
# f = open('demofile/test.txt','a')  # a是 append 往文件里追加
# f.write('哈哈哈\n' *5)

#导入json模块 将数组转为json数据存入文件
import json

# namelist = ['jms','anna']
# #序列化  转为json
# name = json.dumps(namelist)
# fp = open('demofile/test.txt','a')
# fp.write(name)


# 反序列化
# fp = open('demofile/test.txt','r')
# content = fp.read()
# fanxulie = json.loads(content)
# print(type(fanxulie))


# try:
#     open('demofile/test1.txt', 'r')
# except:
#     print('出现异常')