第一周作业

1.在浏览完Python主页（https://www.python.org/）后，我发现其中的Python论坛对我们初学者特别有帮助。里面不仅有针对一些初学者在学习这门语言过程中产生疑问的讨论，还涉及有GUI、游戏开发、Web开发方面的内容。与此同时，论坛还会发布一些已完成的脚本，可以让我们通过直接阅读代码来学习一些良好的编码习惯。

2.假设我已经成为一名Python编程高手，我希望用Python来写爬虫。通过爬如知乎、虎扑等不同论坛的数据，得到诸如不同论坛中性别比例、用户注册地点分布、高频词等数据，分析我国青少年的上网习惯。

3.课后练习

2-2

message = "Hello world!"
print(message)

message = "Hello Python!"
print(message)

2-4

name = "algernon"
print("Hello " + name.lower() + ", would you like to learn some Python today?")
print("Hello " + name.upper() + ", would you like to learn some Python today?")
print("Hello " + name.title() + ", would you like to learn some Python today?")

2-6

famous_person = "Albert Einstein"
message = famous_person + ' once said, "A person who never made a mistake never tried anything new."'
print(message)

2-7

name = "\tAlgernon\n"
print(name)
print(name.lstrip())
print(name.rstrip())
print(name.strip())

2-8

print(6 + 2)
print(9 - 1)
print(4 * 2)
print(8 / 1)

2-9

number = 6
message = "My favorite number is " + number.__str__()
print(message)

2-10

name = "\tAlgernon\n"
print(name)
print(name.lstrip())#去掉字符串左边的空白字符
print(name.rstrip())#去掉字符串右边的空白字符
print(name.strip())#去掉字符串两边的空白字符

number = 6
message = "My favorite number is " + number.__str__()
#用__str__()函数将整数类型变量转化为字符串类型
print(message)