入门第二课

print("Hello wrod")
#这是注释
if True:
    print("zhonggg")
else:
    print("ellllll")

import  keyword
#print(keyword.kwlist)
a,b=5,8
print(type(a))
print(b)
print("abcd\nefg");
word="Python"
print(word[0]);
tylist=["aa","bb"];
print(tylist*2)
sites = {'Google', 'Taobao', 'Runoob', 'Facebook', 'Zhihu', 'Baidu'}
if 'Runoob' in sites:
    print("在集合中")
else:
    print("不在集合中")
a = set('abracadabra')
b = set('alacazam')
# print(a,b);
# print(a-b);
# print(a&b);
# print(a|b);

dd=set('111233');
print(dd);
thisset = set(("Google", "Runoob", "Taobao"))
thisset.add("HEllword");
print(thisset);
hp=['Google', 'Runoob', 1997, 2000];
#hp.__add__("qqq")
print(hp)
tup1 = ('Google', 'Runoob', 1997, 2000)
print(tup1)
tup1 = (12, 34.56)
tup2 = ('abc', 'xyz')
tup3=tup1+tup2
print(tup3)
tup = ('Google', 'Runoob', 1997, 2000)
print(tup)
del tup
print("删除后的元组 tup : ")
dict = {'Name': 'Runoob', 'Age': 7, 'Class': 'First'}
str(dict);
print(str(dict),len(dict),type(dict));
del dict['Name'] # 删除键 'Name'
print ("dict['Age']: ", dict['Age'])
print(dict);
dict.clear()     # 清空字典
print(dict);
del dict
print(dict)
#!/usr/bin/python3
'''
这是多行注释，用三个单引号
这是多行注释，用三个单引号 
这是多行注释，用三个单引号
'''
print("Hello, World!")
dict1 = {'user': 'runoob', 'num': [1, 2, 3]}

dict2 = dict1  # 浅拷贝: 引用对象
dict3 = dict1.copy()  # 浅拷贝：深拷贝父对象（一级目录），子对象（二级目录）不拷贝，还是引用

# 修改 data 数据
dict1['user'] = 'root'
#dict1['num'].remove(1)

# 输出结果
print(dict1)
print(dict2)
print(dict3)

thisset = set(("Google", "Runoob", "Taobao", "Facebook"))
x = thisset.pop()
print(x)
print(thisset);

　Python3