「Python技能树」——文件（练习题）

• 1.遍历文件
• 2.判断文件是否存在
• 3.判断文件是文件夹还是文件
• 4.获取文件大小
• 5.操作zip文件需要使用什么第三方库
• 正确答案

下列哪个语句可以遍历D:file文件夹下的所有文件 ¹

• A

# -*-coding:utf-8-*-
import os
for root,dirs,files in os.walk("D:file"):
    for dir in dirs:
        print(os.path.join(root,dir))
    for file in files:
        print(os.path.join(root,file))

• B

# -*-coding:utf-8-*-
for root,dirs,files in os.walk("D:file"):
    for dir in dirs:
        print(os.path.join(root,dir))
    for file in files:
        print(os.path.join(root,file))

• C

# -*-coding:utf-8-*-
import os
for root,dirs,files in os.walk():
    for dir in dirs:
        print(os.path.join(root,dir))
    for file in files:
        print(os.path.join(root,file))

下面那段语句可以判断D:filea.txt是否存在²

• A

import os
t = os.path.exists()
print(t)

• B

import os
t = os.path.exists("D:\file\a.txt")
print(t)

• C

with open("D:\file\a.txt", "r") as f:
    print(f.read())

如何判断D:filea.txt是文件夹还是文件³

• A

if os.path.isdir("D:\file\a.txt"):
    print("文件夹")
if os.path.isfile("D:\file\a.txt"):
    print("文件")

• B

import os
if os.path.isdir("D:\file\a.txt"):
    print("文件夹")
if os.path.isfile("D:\file\a.txt"):
    print("文件")

• C

if open("D:\file\a.txt", "r"):
	print("文件夹")
if not open("D:\file\a.txt", "r"):
	print("文件")

如何获取D:filea.txt文件的大小⁴

• A

with open("D:\file\a.txt", "r") as f:
	f = f.read()
	f = len(f)
	print(f)

• B

import os
t = os.path.exists("D:\file\a.txt")
print(len(t))

• C

import os
l = os.path.getsize("D:\file\a.txt")
print(l)

有一个zip文件，现在需要在这个zip文件内添加一个文件，需要什么第三方库(多选)⁵

• A·······························需要os模块
• B·······························需要path模块
• C·······························需要sys模块
• D·······························需要zipfile模块