Day2 variable

Today's Contents:
     - three characteristics of the variable 
        type: 
            viewing data type 
        id: 
            represents the variable address in memory, is a string of numbers 
        value: 
            the value of variables

 - process control 
    control process, control the occurrence of certain events
     - if branch is determined: parts:
                        # condition when established perform 
                       Print ( 'condition is satisfied!')
                # If the if condition is not satisfied, here is performed 
               elif Analyzing conditions:
                        Print ( "another condition is satisfied ')
                 # If the if condition is not satisfied, the execution here 
                elif Analyzing conditions:
                        Print ( "another condition is satisfied ')
                 # If the condition is not satisfied if and elif, here is executed 
                else:
                     # If the condition is not satisfied then execute 
                    Print ( 'condition is not satisfied!')

Code

Import Time 
List1 = [ ' 18-year-old tank, is true. ' ]
 # Print (type (List1)) 

# ID 
Print (ID (List1))
 # 4,648,825,800 
# 4,620,567,608 

the time.sleep ( . 5 )
 Print ( " program end, list1 destroyed ' ) 

# variable and non-variable 
# rewriting the data when, id called constant variable type, otherwise called hard type. (Dictation) 
# Variable 
List = [ ' Tank, Jason ' ]
 Print ( ' List1 before modification ID: ' , ID (List1)) 
list1.append ( 'Feng Xu ' ) # [' Tank, 'Jason'] the append. (Feng Xu) 
Print ( ' after list1 modified ID: ' , ID (list1)) 

# immutable: tuple 
tuple1 = (l, 2,3 )
 Print (ID (tuple1))
 Print (type (tuple1)) 
tuple1 = (2,3,4 )
 Print (ID (tuple1))
 '' ' 
the user interacts with the program: 
     iNPUT () input 
     print () output 
 ' '' 
username = iNPUT ( ' enter username: ' )
 Print (username) 
password = iNPUT ( ' Please enter your password ' )
 Print(password) 

# if: 
# username == 'tank'ture 
# and: the left and right conditions are only for the Ture Ture, otherwise to false 
# password ==' 123 'Ture 
# determines if condition: If the condition is determined == Ture , under the code execution IF 
IF username == ' Tank ' and password == ' 123 ' :
    # false and false ture --- >> 
   Print ( ' Login successful ' )
 the else :
    Print ( ' Login failed ' ) 

# placeholder Fu:% S 
str1 = ' handsome ' 
Print( ' Tank S% ' % (str1,)) # Tank handsome 


str2 = '' 
Print ( ' confidence to develop mind. 1: S% ' % (str2,)) 

price1 = INPUT ( ' Enter the user deductions month monthly: ' ) 
All = the iNPUT ( ' Please enter the user's current balance: ' ) 

Print ( ' Dear mobile users, your monthly rent for the month [% s] yuan, account balance [% s] dollars! ' 
        % (price1 , All)) 

# - arithmetic operators) 
Print (+. 1. 1) # ( 
N1. 1 = # N1 = N1 + N1 +. 1 # 
# Print (N1) # 2

+. 1 = N1 #   assignment operator: - = Print (10-1) # . 9 #   * = Print (* 12 is 12 is)   # 144 Print (11/3) # 3.666 .... Print (11/3)   # . 3 Print (. 11%. 3)   # 2 # comparison operators Print (== 2. 1) # False Print (. 1> 2) # FASLE Print (. 1 <2) # True Print (. 1> = 2) # FASLE Print (. 1 < 2 =) # True #   iS: the above mentioned id compares two variables are equal


















10 = X Print (ID (X) == ID (X)) # True Print (X IS X) # True # logical operators 
# and: the left and right conditions are True it is True, otherwise to false Print (X 1 == and the X-== 10) # False Print (== the X-10 and the X-== 10) # True # or: to determine whether the two sides set up, it was established 1 True Print (== the X-10 or the X-== . 1)   # ture # Not: Invert Print (X == 10)   #   ture Print ( Not X == 10)   #












to false 

# NO -> and -> or 
#          to true or to false 
Print ( Not X ==. 1 or X == 10 and X 20 is ==) # True 
# chain assignment 
n-10 = 
Y = n- 
Z = n-
 Print ( n-, y, Z) 

n- = Z = y = 10
 Print (n-, y, Z) 

# intersecting assignment 
X = 10 
y = 20 is
 # X and the value of y is interchanged 
# X = 10 y = 20 is 
Z = y # 10 
Y = X- # 20 is 
Y = Z # 10 

X = 10
The Y = 20 is
 # 10,20 = Y = 10, X = 20 is 
X, Y = Y, X
 Print (X, Y) # 20,10 
# decompression assigned 
#    0. 1 2 
List1 = [l, 2,3 ] 
X = List1 [0] 
Y = List1 [. 1 ] 
Z = List1 [2 ]
 Print (X, Y, Z) # . 1 2. 3 
X, Y, Z = List1
 Print (X, Y, Z) # . 1 2. 3 




'' ' 
iF branch 
' '' 
# guess character game: guess whether the character entered by the user is 9527. 
Number the = 9527 
gUESS = the iNPUT ( ' Please enter the digital guess ' )
Print (GUESS)
 Print (of the type (GUESS)) # str 


# string into an integer type 
GUESS = int (GUESS)
 Print (of the type (GUESS)) # int 

IF GUESS == Number The:
    Print ( ' guessed it! ' )
 elif gUESS < Number the
    Print ( ' guess small ' )
 the else :
    Print ( ' I guess big! ' )

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