Three characteristic variables:
-type: see the type of data
-id: represents the variable address in memory, is a string of numbers
-value: value of the variable
)) # Tank handsome str2 = 'faith with me, I will destroy all strong! '
Print (' confidence to develop note 1:% s'% (str2 ,))
price1 = input ( 'Enter the user month monthly fee deduction:')
All = INPUT ( 'Enter the user's current balance:')
Print ( 'Dear mobile user, is your monthly month [% s] element, account balance [% s] element '% (price1, All))!
# - arithmetic operators
Print (. 1 +. 1) # 2
N1 =. 1
# N1 = N1 +. 1 # N1 + =. 1
# Print (N1) # 2
N1 +. 1 =
# assignment operator: - =
Print (10 -. 1). 9 #
# * =
Print (* 12 is 12 is) # 144
Print (. 11 /. 3) # 3.666 ...
Print (//. 3. 11) # . 3
Print (. 11%. 3) # 2
# comparison operators
Print (== 2. 1) # False
Print (. 1> 2) # False
Print (. 1 <2) # True
Print (. 1> = 2) # False
Print (. 1 <= 2) True #
# iS: comparing whether the two variables are equal id
X = 10
Print (id (X) == id (X)) # True
Print (X X IS) #True
# logical operators
X # Y = 20 is
# And: the left and right conditions are True it is True, otherwise False
Print (X == == X. 1 and 10) False #
Print (X 10 and X == == 10) True #
# or: Analyzing sides the condition is established, it was established 1 True
Print (the X-10 or the X-== == 1) True #
# not: contrary
Print (the X-== 10) # True
Print (not the X-== 10) False #
# NO -> and -> or
# True or False
Print (Not X X == ==. 1 or 10 and 20 is X ==) True #
# assignment chain
n-10 =
Y = n-
Z = Y
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
# y = 10 X = 20 is
Z = X # 10
X = 10
Y = 20 is
Y = Z # 10
# 10, 20 is = Y = 10, X = 20 is
X, Y = Y, X
Print (X, Y) # 20 is 10
# decompression assigned
# 0. 1 2
List1 = [. 1, 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 the branch
'' '
# guessing game characters; the characters entered by the user to guess whether 9527.
Number the = 9527
gUESS the iNPUT = (' Please enter guessing numbers: ')
Print (gUESS)
Print (of the type (gUESS)) # str
# the string into an integer type
gUESS = int (gUESS)
Print (of the type (gUESS)) # int
IF == Number the gUESS:
Print ( 'guessed it!')
elif gUESS <Number the:
Print ( 'guess small' )
the else:
print ( 'big guess!')
''' While loop:
syntax:
the while judging criteria:
# If the conditions are met the "loop" execute the following code
printt ( '111')
'' '
#import Time
# True:
# Print (1111)
# the time.sleep (1)
# Berak
# guess character game: guess whether the character entered by the user is 9527, restrictions can only guess three times.
= 9527 Number
init = 2. 1. 1 # 3. 4
the while True:
# 3 if the end of the cycle is greater than init
IF init> 3:
Print ( 'wrong 3 times, gun bar')
BREAK
GUESS = INPUT ( 'Enter number to guess: ')
gUESS = int (gUESS)
IF gUESS == Number:
Print ('! guessed ')
BREAK
elif gUESS <Number:
the else:
Print ( '! big guess')
the init + =. 1
Process Control
Control of the process, control the occurrence of certain events.
-if Branch decision:
grammar:
if the judge Stripe:
# If the conditions are set up to perform
print ( 'condition is satisfied!')
# If the if condition is not satisfied, the execution here
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 if and elif conditions are not satisfied, the execution here
else:
# If the condition is not satisfied is executed
print ( 'condition is not satisfied!')