Python basic data types and Process Control applications

#2017-05-05 22:10:10
One, user login and failure to lock the account                           

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1. file reading and writing
2. List Split method
3.while Cycle

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##############################
#datafile文件内容
#larry |123123|1
#linzj |123123|0
##############################
#!/usr/bin/env python
#-*-Coding:utf-8-*-

# Open File Read user information
F1=open (' datafile ', ' R ')
Data=f1.read ()
F1.close ()

# User information reproduced in user information list
User_info_list=[] # Initialize User_info_list
User_str_list=data.split (' \ n ')
# Print (user_str_list)
For item in User_str_list:
Temp=item.split (' | ')
v={' name ': temp[0],
' pwd ': temp[1],
' Times ': temp[2]
}
if int (v[' Times '])!=3: # Resets the non-locked account login information
V[' times '] = 0
User_info_list.append (v)
Print (user_info_list)

# Login Verification
I=0
J=1
While J==1:
V_user_name = input (' User name: ')
V_pwd = input (' Password: ')
For item in User_info_list:
If item[' name '] = = v_user_name and int (item[' Times ') <3:
If item[' pwd '] = = V_pwd:
j=2 # Login successful, set the loop exit
Print (' Welcome back ' +v_user_name)
Else
i = int (item[' Times ')
i + = 1
Item[' times '] = I
Print (item)
Print (user_info_list)
Continue
Elif item[' name '] = = v_user_name and int (item[' Times ']) >=3:
Print (v_user_name+ ' is locked ')
Else
Continue
Print (user_info_list)

# Assign log information of user login to target variable
K=0
Target= "
For item in User_info_list:
Print (item[' name '])
If target!= ':
target=target+ ' \ n '
#target. Append (item[' name ']+ ' | ' +item[' pwd ']+ ' | ' +str (item[' Times '))
target=target+item[' name ']+ ' | ' +item[' pwd ']+ ' | ' +str (item[' Times ')
Print (target)

# Write the target variable value to the file
F2=open (' datafile ', ' W ')
F2.write (target)
F2.close ()

ii. Classification of elements

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1. List Append methods
2.for Cycle
3.if Process Control

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ELEMENT_LIST=[11,22,33,44,55,66,77,88,99]

K1=[]
K2=[]
For item in Element_list:
    #print (item)
    If item<66:
        K1.append (item)
    Else
        K2.append (item)

Print (K1,K2)
v_dict={' K1 ': K1, ' K2 ': K2}
Print (v_dict)

Third, shopping settlement and recharge                                    

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1. File read and write operations
2. Looping through the list
3. Shaping and converting string data types to each other

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#!/usr/src/python
#-*-Coding:utf-8-*-

Import re
# Commodity Initialization
v_goods_list=[
{' name ': ' Computer ', ' price ': ' 1000 '},
{' name ': ' Mouse ', ' price ': ' 50 '},
{' name ': ' Keyboard ', ' price ': ' 100 '},
{' name ': ' Smelly socks ', ' price ': ' 2 '},
]

# list Items
For item in V_goods_list:
Print (item)
#print (V_goods_list)

# Show Balance
F1=open (' balance ', ' r ')
Balance=f1.read ()
F1.close ()

# Select Goods
V_aws=1
V_total=0
While V_aws==1:
If v_aws!=1:
Break
V_goods=input (' Select product number: ')
V_goods=int (V_goods)
V_num=input (' Quantity of Goods: ')
If v_goods==3:
Print (' Emma bought ' +v_num+ ' double ' +v_goods_list[v_goods][' name ')
V_num=int (V_num)
#加入购物车
If V_goods<len (v_goods_list):
V_total+=int (v_goods_list[v_goods][' price ') *v_num
Print (V_total)
Else
Print (' Number selection Error! ‘)
V_aws=input (' clearing? ')
v_aws = Int (v_aws)

# Billing
J=1
While J==1:
If V_total>int (balance):
Print (' Insufficient balance, please recharge ')
V_balance = input (' Recharge amount: ')
Print (v_balance)
balance = Int (v_balance) + int (balance)
Print (balance)
Elif v_total==0:
Pass
Else
Balance=balance-v_total
Print (' Buy success ')
J=0

# Balance Write back File save
F2=open (' Balance ', ' W ')
F2.write (str (balance))
F2.close ()

四、三级 linkage                                 

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Mutual nesting of dictionaries and lists
For loop traversal
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#!/usr/src/python
#-*-Coding:utf-8-*-

dic={
    ' Hebei ': {
        ' Shijiazhuang ': ["Luquan", "Gaocheng", "Yuanshi"],
        ' Handan ': ["Yongnian", "she County", "CI"]},
    ' Shandong ': {
        ' Jinan ': ["Gao Yang", "Baotu Spring", "Taian"],
        ' Liaocheng ': ["Qingdao", "Bozhou", "Qian County"]},
    ' Guizhou ': {
        ' Zunyi ': ["Obey the County", "Tongzi", "Michizane"],
        ' Bijie ': ["Nayong", "Weining", "Qianxi"]
    }
}
For item in Dic.keys ():
    Print (item)
V_fir_region=input (' Please select Province ')
For item in Dic[v_fir_region]:
    Print (item)
V_sec_region=input (' Please select City ')
For item in Dic[v_fir_region][v_sec_region]:
    Print (item)

Python basic data types and Process Control applications