【Python爬虫】-笨办法学 Python 习题 13-17

习题 13:  参数、解包、变量

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)

#在Run/Debug Configurations 里Script parameters设置argy 参数

习题 14:  提示和传递

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 ask you a few questions.")

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 liking me.

You live in %r. Not sure where that is.

And you have a %r computer. Nice.

"""% (likes,lives,computer))

习题 15:读取文件

fromsysimportargv

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())

习题 16:读写文件

from sys import argv

script,filename = argv

print("We're going to erase %r."% filename)

print("If you don't want that, hit CTRL-C (^C).")

print("If you do want that, hit RETURN.")

input("?")

print("Opening the file ...")

target =open(filename,"w")

print("Truncating the file. Goodbye!")

target.truncate()

print("Now I'm going 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("\n")

target.write(line2)

target.write("\n")

target.write(line3)

target.write("\n")

print("And finally, we close it.")

target.close()

习题 17:  更多文件操作

from sys import argv

fromos.pathimportexists

script,from_file,to_file = argv

print("Copying from %s to %s"% (from_file,to_file))

# we could do these two on one line too, how?

get =open(from_file)

indata = get.read()

print("The input file is %d bytes long"%len(indata))

print("Does the output file exist? %r"% exists(to_file))

print("Ready, hit RETURN to continue, CTRL-C to abort.")

input()

output =open(to_file,"w")

output.write(indata)

print("Alright, all done.")

output.close()

get.close()