1.讀取一個(gè)文件，顯示除了井號(hào)(#)開(kāi)頭的行意外的所有行

# -*- coding: utf-8 -*-

"""

Created on Tue May 28 09:37:08 2019

@author: Omega_Sendoh

"""

#打開(kāi)文件

f = open("install-sh","r")

#讀取文件的所有行，以列表形式存儲(chǔ)，每行為列表中的一個(gè)字符串元素

res = f.readlines()

#循環(huán)整個(gè)列表，去除以空格開(kāi)頭的行的空格，然后去除以#號(hào)開(kāi)頭的行的#號(hào)

for i in res:

if i[0] == "#":

continue

else:

print(i)

2.無(wú)重復(fù)字符的最長(zhǎng)子串

# -*- coding: utf-8 -*-

"""

Created on Tue May 28 10:57:55 2019

@author: Omega_Sendoh

"""

"""

定義一個(gè)空的字符串，從起始位置開(kāi)始搜索輸入的字符串，如果字符沒(méi)有出現(xiàn)在wind中，則把字符加入wind

如果字符出現(xiàn)在wind中，則找到字符串中出現(xiàn)該相同字符的位置，刪除該重復(fù)字符之前的所有字符

并重新加入該字符

"""

def LongestString(s):

wind = ''

l=0

for i in s:

if i not in wind:

wind +=i

l=max(l,len(wind))

else:

wind = wind[wind.index(i)+1:] + i

return l

s=input('enter string:')

print(LongestString(s))

3.制作一個(gè)密碼簿，其可以存儲(chǔ)一個(gè)網(wǎng)址，和一個(gè)密碼，請(qǐng)編寫(xiě)程序完成這個(gè)密碼簿的增刪改查功能，并且實(shí)現(xiàn)文件存儲(chǔ)功能。

import json

def add_info():

#打開(kāi)存儲(chǔ)文件，判斷文件中是否有內(nèi)容

with open('usr.json','a+') as f:

info = f.read()

#如果沒(méi)有內(nèi)容，創(chuàng)建一個(gè)字典，以字典的方式存儲(chǔ)網(wǎng)址與密碼

if not info:

with open('usr.json','a+') as f:

full_info = {}

net_add = input('enter your URL:')

passwd = input('enter your password:')

full_info[net_add] = passwd

print('add success')

json.dump(full_info,f)

#若文件中有內(nèi)容，則把文件中的內(nèi)容轉(zhuǎn)換為python的字典類(lèi)型

else:

with open('usr.json','r') as f :

full_info = json.load(f)

#print((full_info))

net_add = input('enter your URL:')

passwd = input('enter your password:')

full_info.setdefault(net_add,passwd)

print('add success')

#給字典中添加對(duì)象，再次寫(xiě)入文件中(即添加新的信息后重新更新文件的內(nèi)容)

with open('usr.json','w') as f :

json.dump(full_info,f)

def del_info():

with open('usr.json','r') as f:

full_info = json.load(f)

#輸入想要?jiǎng)h除的網(wǎng)址

net_add = input('enter your delete URL:')

#如果該網(wǎng)址存在，則刪除網(wǎng)址與密碼，把更改后的數(shù)據(jù)存到文件中

if net_add in full_info:

del full_info[net_add]

print('delete success')

with open('usr.json','w') as f:

json.dump(full_info,f)

#若該網(wǎng)址不存在，提示網(wǎng)址不存在

else:

print('This URL not exist')

def change_info():

with open('usr.json','r') as f:

full_info = json.load(f)

#輸入要更改的網(wǎng)址與密碼

net_add = input('enter your change URL:')

passwd = input('enter your new password:')

if net_add in full_info:

full_info[net_add] = passwd

print('change password succcess')

with open('usr.json','w') as f:

json.dump(full_info,f)

else:

print('This URL not exist')

def check_info():

with open('usr.json','r') as f:

full_info = json.load(f)

net_add = input('enter your check URL:')

if net_add in full_info:

print('This URL password is:',full_info[net_add])

else:

print('This URL not exist')

print('you can choose: add/del/change/check/quit')

while 1:

obj = input('enter your choose:')

if obj == 'add':

add_info()

elif obj == 'del':

del_info()

elif obj == 'change':

change_info()

elif obj == 'check':

check_info()

else:

break

運(yùn)行結(jié)果：

總結(jié)

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