习题 1
print("Hello World!")
print("Hello Again")
print("I like typing this.")
print("This is fun.")
print('Yay! Printing.')
print("I'd much rather you 'not'.")
print('I "said" do not touch this.')
运行结果
加分题 1：让你的脚本再多打印一行
print("Hello World!\n")
print("Hello Again")
print("I like typing this.")
print("This is fun.")
print('Yay! Printing.')
print("I'd much rather you 'not'.")
print('I "said" do not touch this.')
运行结果
加分题 2：让你的脚本只打印一行
print("Hello World!", end='')
print("Hello Again", end='')
print("I like typing this.", end='')
print("This is fun.", end='')
print('Yay! Printing.', end='')
print("I'd much rather you 'not'.", end='')
print('I "said" do not touch this.')
运行结果
加分题 3： 在一行的起始位置放一个 ‘#’ 符号的作用是什么？
‘#’ 表示注释，告诉解释器这段代码不解释执行。
知识点
-
print(*objects, sep='', end='\n', file=sys.stdout, flush=False)这是 print() 函数的原型。默认是以 \n 结尾，即换行。把end='\n'换掉就可以改变打印格式。
习题 2
# A comment, this is so you can read your program later.
# Anything after the # is ignored by python.
print("I could have code like this.") # and the comment after is ignored
# You can also use a comment to "disable" or comment out a piece of code:
# print "This won't run."
print("This will run.")
运行结果
习题 3
print("I will now count my chickens:")
print("Hens", 25 + 30 // 6)
print("Roosters", 100 - 25 * 3 % 4)
print("Now I will count the eggs:")
print(3 + 2 + 1 - 5 + 4 % 2 - 1 / 4 + 6)
print("Is it true that 3 + 2 < 5 - 7?")
print(3 + 2 < 5 - 7)
print("What is 3 + 2?", 3 + 2)
print("What is 5 - 7?", 5 - 7)
print("Oh, that's why it's False.")
print("How about some more.")
print("Is it greater?", 5 > -2)
print("Is it greater or equal?", 5 >= -2)
print("Is it less or equal?", 5 <= -2)
运行结果
知识点
习题 4
cars = 100
space_in_a_car = 4.0
drivers = 30
passengers = 90
cars_not_driven = cars - drivers
cars_driven = drivers
carpool_capacity = cars_driven * space_in_a_car
average_passengers_per_car = passengers / cars_driven
print("There are", cars, "cars available.")
print("There are only", drivers, "drivers available.")
print("There will be", cars_not_driven, "empty cars today.")
print("We can transport", carpool_capacity, "people today.")
print("We have", passengers, "to carpool today.")
print("We need to put about", average_passengers_per_car, "in each car.")
运行结果
习题 5
my_name = 'Zed A. Shaw'
my_age = 35 # not a lie
my_height = 74 # inches
my_weight = 180 # Lbs
my_eyes = 'Blue'
my_teeth = 'White'
my_hair = 'Brown'
print("Let's talk about %s." % my_name)
print("He's %d inches tall." % my_height)
print("He's %d pounds heavy." % my_weight)
print("Actually that's not too heavy.")
print("He's got %s eyes and %s hair." % (my_eyes, my_hair))
print("He's teeth are usually %s depending on the coffee." % my_teeth)
# this line is tricky, try to get it exactly right
print("If I add %d, %d, and %d I get %d." % (my_age, my_height, my_weight, my_age + my_height + my_weight))
运行结果
知识点
Python 格式符：
%s 字符串 (采用str()的显示)
%r 字符串 (采用repr()的显示)
%c 单个字符
%b 二进制整数
%d 十进制整数
%i 十进制整数
%o 八进制整数
%x 十六进制整数
%e 指数 (基底写为e)
%E 指数 (基底写为E)
%f 浮点数
%F 浮点数，与上相同
%g 指数(e)或浮点数 (根据显示长度)
%G 指数(E)或浮点数 (根据显示长度)
习题 6
x = "There are %d types of people." % 10
binary = "binary"
do_not = "don't"
y = "Those who know %s and those who %s." % (binary, do_not)
print(x)
print(y)
print("I said: %r." % x)
print("I also said: '%s'." % y)
hilarious = False
joke_evaluation = "Isn't that joke so funny?! %r"
print(joke_evaluation % hilarious)
w = "This is the left side of..."
e = "a string with a right side."
print(w + e)
运行结果
知识点
%s 与 %r 的区别
# %r 打印出来的是你写在脚本里的内容
formatter = "%r %r %r %r"
print(formatter % ('one', 'two', 'three', 'four'))
输出:
D:\Anaconda3\python.exe G:/python3_project/week_one/ex10.py
'one' 'two' 'three' 'four'
Process finished with exit code 0
# %s 打印的是你应该看到的内容。
formatter = "%s %s %s %s"
print(formatter % ('one', 'two', 'three', 'four'))
输出：
D:\Anaconda3\python.exe G:/python3_project/week_one/ex10.py
one two three four
Process finished with exit code 0
习题 7
print("Mary have a little lamb.")
print("Its fleece was white as %s." % 'snow')
print("And everywhere that Mary went.")
print("." * 10) # what'd that do?
end1 = "C"
end2 = "h"
end3 = "e"
end4 = "e"
end5 = "s"
end6 = "e"
end7 = "B"
end8 = "u"
end9 = "r"
end10 = "g"
end11 = "e"
end12 = "r"
# watch that comma at the end. try removing it to see what happens
print(end1 + end2 + end3 + end4 + end5 + end6, end=' ')
print(end7 + end8 + end9 + end10 + end11 + end12)
运行结果
习题 8
formatter = "%r %r %r %r"
print(formatter % (1, 2, 3, 4))
print(formatter % ("one", "two", "three", "four"))
print(formatter % (True, False, False, True))
print(formatter % (formatter, formatter, formatter, formatter))
print(formatter % ("I had this thing.",
"That you could type up right.",
"But it didn't sing.",
"So I said goodnight."))
运行结果
知识点
# 三引号打印任意多行文字
print('''
There's something going on here.
With the three double-quotes.
We'll be able to type as much as we like.
Even 4 lines if we want, or 5, or 6.
''')
习题 9
# Here's some new strange stuff, remember type it exactly.
days = "Mon Tue Wed Thu Fri Sat Sun"
months = "Jan\nFeb\nMar\nApr\nMay\nJun\nJul\nAug"
print("Here are the days:", days)
print("Here are the months:", months)
print('''
There's something going on here.
With the three double-quotes.
We'll be able to type as much as we like.
Even 4 lines if we want, or 5, or 6.
''')
运行结果
习题 10
tabby_cat = "\tI'm tabbed in."
persian_cat = "I'm split\non a line."
backslash_cat = "I'm \\a\\ cat."
fat_cat = """
I'll do a list:
\t* Cat food
\t* Fishies
\t* Catnip\n\t* Grass
"""
print(tabby_cat)
print(persian_cat)
print(backslash_cat)
print(fat_cat)
运行结果
知识点
Python转义字符：
\(在行尾时) 续行符
\\ 反斜杠符号
\' 单引号
\" 双引号
\a 响铃
\b 退格(Backspace)
\e 转义
\000 空
\n 换行
\v 纵向制表符
\t 横向制表符
\r 回车
\f 换页
\oyy 八进制数，yy代表的字符，例如：\o12代表换行
\xyy 十六进制数，yy代表的字符，例如：\x0a代表换行
\other 其它的字符以普通格式输出
