笨办法学python ex11-20

ex11

# -*- coding: utf-8 -*-
print "How old are you?" # add ',(comma)' 防止输出新行，结束此行
age = raw_input()
print "How tall are you?",
height = raw_input() # 接受，而input(),把输入 sth 当python 代码处理
print "How much do you weigh?",
weight = raw_input()
print "So,you're %r old ,%r tall and %r heavy." %(age ,height, weight)x = int(7.8) #  int()转换成整数
print x ,
a = int(float(raw_input())),
print a
w = input(),# 输入除纯数字字符串之前加u，使用%s 正常
print w
# raw_input 将所有输入作为字符串看待，返回字符串类型。
# input 只能接受合法的python表达式。

ex12

# -*- coding: utf-8 -*-
age = raw_input("How old are you?") # 添加文字
height = raw_input("How tall are you?")
weight = raw_input("How much do you weigh?")
print "So , you're %r old, %r tall and %r heavy." %(age, height, weight )

ex13

# -*- coding: utf-8 -*-
from sys import argv # import（输入）是将python的功能引入脚本的办法，
# argv (是argument variable) 参数变量
script, first, second, third = argv
# 将argv解包，将所有参数放到同一个变量下,必须输入三个变量，先写script（脚本）,
print "The script is called:", script
print "Your first variable is:",first
print "Your second variable is:",second
print "Your third variable is:",third
#当运行时提供的参数个数不对时，错误信息，‘need more than xx values to unpack.’

ex14

# -*- coding: utf-8 -*-
from sys import argv
script, user_name, age = argv
prompt = '>' # use '>' as a 提示符
print "Hi %s, and you're %r, I'm the %s script." % (user_name, age,script)
print "I'd like to ask you a few questions."
print "Do you like me %s ?"% user_name
likes = raw_input(prompt)print "Where do you live %s?" %user_name
lives = raw_input(prompt)print "What kind of computer do you have?"
computer = raw_input(prompt)print """
Alright, so you said %r about liking me.
You live in %r. Not sure where that is.
And you have a %r computer. Nice.
""" %(likes, lives, computer)

ex15

# -*- coding: utf-8 -*-
from sys import argv
script, filename = argvtxt = open(filename) # 获得文件名,需要在同一个文件里，return a file object.print "Here's your file %r:" % filename
print txt.read() # read 读取文本内容print "Type the filename again:"
file_again = raw_input('<')txt_again = open(file_again)print txt_again.read()

ex16

# -*- coding: utf-8 -*-
from sys import argvscript, filename = argv
print "We're going to erase %r." % filename
print "If you don't want that, hit CTRL-C (^C)."
print "If you want that, hit REATURN."raw_input("?")
print "Opening the file..."
target = open(filename,'w') # 用“w" 模式打开， w ,write写入模式， r , read 读取模式，
# a ,append追加模式， "w+""r+""a+"同时读写打开， 直接open(filename) in r 这是默认工作方式。print "Truncating the file. Goodbye!"
target.truncate() # xx.turncate 清空文件print "Now I'm going to ask you for three lines."line1 = raw_input("line 1: ")
line2 = raw_input("line 2: ")
line3 = raw_input("line 3: ")print "I'm going to write these to the file."target.write(line1) # write写入
target.write("\n")
target.write(line2)
target.write("\n")
target.write(line3)
target.write("\n")print "And finally, we close it."target.close()

ex17

# coding= utf-8
from sys import argv
from os.path import existsscript, from_file, to_file = argv# 输入的文件名若不存在将创建一个新的print "Copying from %s to %s." % (from_file, to_file)#We could do these two on one line too, how?
in_file = open(from_file)
indata = in_file.read() #将文件数据存在indataprint "The input file is %d bytes long" % len(indata)# len 字节长度print "Does the output file exist?%r" %exists(to_file)# exists 将文件名字符串作为参数，
#文件存在返回True , 不存在返回Falseprint "Ready, hit RETRUN to countiue, CTRL-C to abort."
raw_input()out_file = open(to_file, "w")
out_file.write(indata)print "Alright, all done."out_file.close()
in_file.close()

ex18

# -*- coding: utf-8 -*-# this is like you scripts with argv
def print_two(*args):  # def is define. 'print_two' is name of function.arg1, arg2 = args # ':' 用来结束本行，此代码用解压参数print "arg1: %r, arg2: %r" % (arg1,arg2) # 5行"*" 作用把所有参数接受放到args 中去
# 函数名称可以是字母数字下划线，但不能是数字开头
# ok, that *args is actually pointless. we can just do this
def print_two_again(arg1, arg2):print "arg1: %r, arg2: %r" % (arg1, arg2) # 其实可以不用解压# this just takes one argument
def print_one(arg1):print "arg1: %r" % arg1 # this one takes no argument
def print_none():print "I got nothin'."print_two("Zed","Shaw")
print_two_again("Zed","Shaw")
print_one("First!")
print_none()

ex19

# -*- coding: utf-8 -*-def cheese_and_crackers(cheese_count, boxes_of_crackers):print "You haxe %d cheeses." % cheese_countprint "You have %d boxes of crackers!" % boxes_of_crackersprint "Man that's enough for a party!"print "Get a blanket. \n"print "we can just give the function numbers dirextly:"
cheese_and_crackers(20, 30) # 定义函数后，你可以直接输入数到函数中去。print "OR,we can use variables from our script:"
amount_of_cheese = 10
amount_of_crackers = 50cheese_and_crackers(amount_of_cheese, amount_of_crackers) # 亦可以赋值给参数print "We can even do math inside too:"
cheese_and_crackers(10 + 20, 5 + 6) # 还可以在函数中进行数学运算print "And we can combine the two, variables and math:"
cheese_and_crackers(amount_of_cheese + 100, amount_of_crackers + 100) # 赋值的参数可以同直接
# 输入的数字做数学运算

ex20

# -*- coding: utf-8 -*-from sys import argv
script, input_file = argvdef print_all(f):print f.read()def rewind(f):f.seek(0) # 'f'只是一个变量名，f.seek(0) 每次运行它时就回到了文件的开始，0 byte ,即第一个byte的位置def print_a_line(line_count, f):print line_count, f.readline() # f.readline() 读取文件的一行，然后移到\n 后current_file = open(input_file)print "First let's print the whole file:\n", #  在print 语句后加, 就不会把他自己的\n 打印出来了
# readline 函数返回的内容中包含文件本来就有的\n，而 print 打印时又会添加 \n ,所以！
print_all(current_file)print "Now let'rewind, kind of like a tape."rewind(current_file) # 运行f.seek(0)回到0字节处print "Let's print three lines:"current_line = 1 # current_line 是独立变量需手动改值
print_a_line(current_line, current_file) current_line = current_line + 1
print current_line
print_a_line(current_line, current_file)current_line += 1#'+=' 是x = x + y 的简写 x += y
print current_line
print_a_line(current_line, current_file )

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