python学习5——提示、传递以及读写文件。

一、import命令。

from sys import argv
script, first, second, third = argv
print("The script is called:", script)
print("Your first variable is:", first)
print("Your second variable is:", second)
print("Your third variable is:", third)

输出结果：

from sys import argv
script, user_name, = argv
prompt="*"
print("Hi %s, I'm the %s script." %(user_name, script))
print("I'd like to know more about you.")
print("Do you like me %s?" %user_name)
likes = input(prompt)
print("Where do you live %s?" %user_name)
lives= input(prompt)
print("What kind of computer do you have?")
computer=input(prompt)
print( '''
Alright, so you said %r about likeing me.
You live in %r. Not sure where that is.
And you have a %r computer. Nice.
''' %(likes, lives, computer))

输出结果（注意：运行时要将名字赋给脚本，此处输入Nick为名字）

 二、读写文件。

from sys import argv
script, filename = argv 
print(" We are going to change %r." % filename)
print("If you don't want that, hit Esc.")
print("If you do want that, hit Enter.")
input("?")
print("opening the file...")
target = open( filename,'w')
print("Goodbye!")
target.truncate()
print("Now I'm goinf to ask you for three lines.")
line1 = input("line 1:")
line2 = input("line 2:")
line3 = input("line 3:")
print("I'm going to write these to the file.")
target.write(line1)
target.write("
")
target.write(line2)
target.write("
")
target.write(line3)
target.write("
")
print("And then, we change it.")

此处建立一个空的txt文件，命名为10.py

输出结果：

并且打开10.txt，文件已经被写入。 

 三、读取文件。

from sys import argv
script, filename=argv
txt= open(filename)
print("Here's your file %r:" %filename)
print(txt.read())
print("Type the filename again:")
file_again=input("<")
txt_again = open(file_again)
print(txt_again.read())

输出结果：