2018.7.3 python

One, while loop

1. Cycle. While loop
    While condition:
        code block (loop body)
    Execution process:
        1. Determine if the condition is true. If it's true. Execute code block
        2. Again to determine whether the condition is true ...
        3. When the condition is false. Execute else jumps out of the loop. End of cycle
Cases

 count=1 
 While count<3: 
 Print ("hehe") 
 Count=count+1 
 
 while True: 
 s=input ("Enter password:") 
 If s== "5": 
 Break 
 Print ("Output password" +s) 
 "" 
 # while True: 
 # s=input ("Enter password:") 
 # if s== "5": 
 # break 
 # 
 # if ' 6 ' in S: 
 # print ("Okle") 
 # Continue 
 # print ("Output password" + s) # count=1 
 # sum=0 
 # while count<=100: 
 # sum=sum+count 
 # count=count+1 
 # print (sum) 
 # count= 1 
 # while count<=100: 
 # if count%2!=0: 
 # Print (count) 
 # count=count+1 
 # count=1 
 # W Hile count<=100: 
 # if count% 2 = = 0: 
 # Print (count) 
 # count+=1 #count = Count +1 

# 1+2+3+4+5+6+7+8....+100 =?
# count = 1
# # Prepare a variable
# sum = 0
# while Count <= 100:
#     # Add to Sum
#     sum = sum + Count   # Adds the value in sum (the result of the previous operation) and the number of the current number
#     Count = count + 1
# Print (SUM)

# output 1-100 all the odd numbers.
# count = 1
# while Count <= 100:
#
#     if count% 2! = 0:
#         Print (count)
#
#     Count = count + 1

Two, formatted output
    %s: A placeholder for a string that can place any content (number)
    %d: Placeholder for number
Cases

# NAME = input ("Please enter Name:")
# age = Input ("Please enter your Ages:")
# hobby = Input ("Enter your hobby:")
# gender = input ("Please enter your Gender:")
#
# # print (name+ "+age+" year old, is an old man, hobby is "+hobby+", Sex: "+gender)
# #  %s: Placeholder representing a string
# print ("%s This year, is an old man, hobby is%s, gender:%s"% (name, age, hobby, gender))

# a = 108
# s = "The mission of the Liangshan water park with%d kn B"% (a)
# print (s)

# name = "a"
# print ("%s has been fond of the girl of Shahe%%2"% name)  # If a placeholder is in the string. Then all the% behind is a placeholder. Need to be escaped
Print ("B-color. Like the girl in Changping%5") # This sentence does not have a placeholder. % or%

Three, operator
    Logical operation:
      and and the meaning. The left and right values must both be true. The result of the operation is true.
       or OR. One of the left and right ends is true. The result is true. All is false. The result can be false
      the meaning of not is not. It turns out to be false. It's true now.  Not true or false, not false both true
Break   ends the loop. Stop the current layer loop
Continue  end the current cycle. Proceed to the next loop
Cases

# Computer-Used data
# print (2**0) # 1
# print (2**1) #2
# Print (2**2)
# Print (2**3)
# Print (2**4)
# Print (2**5)
# Print (2**6)
# Print (2**7)
# Print (2**8)
# Print (2**9)
# Print (2**10)

# assignment operation.
# a = 10
# A + = # a = a + 20
# Print (a)

# print (not, not, not = not False)

# and or not exist at the same time. First the parentheses, then the not, and then the and, and finally the OR
# print (3>4 or 4<3 and 1==1) # False
#
# Print (1 < 2 and 3 < 4 or 1>2)
# print (2 > 1 and 3 < 4 or 4 > 5 and 2 < 1)
# print (1 > 2 and 3 < 4 or 4 > 5 and 2 > 1 or 9 < 8)
# print (1 > 1 and 3 < 4 or 4 > 5 and 2 > 1 and 9 > 8 or 7 < 6)
# print (not 2 > 1 and 3 < 4 or 4 > 5 and 2 > 1 and 9 > 8 or 7 < 6)

# x or Y if x==0 so is Y, otherwise x
# print (1 or 2) # 1
# Print (2 or 3) # 2
# print (0 or 3) # 3
# print (0 or 4) # 4

# print (0 or 1 or 3 or 0 or 5) #
# Print (1 and 2) # 2
# print (2 and 0) # 0
# print (0 and 3) # 0
# print (0 and 4) # 0
Print (0 or 4 and 3 or 7 or 9 and 6)

# print (2 > 3 and 3) # false equals 0
# Print (2 < 1 and 4 > 6 or 3 and 4 > 5 or 6)
Four, While...else
Cases

Count  = 1
While Count  <= 10:
    Print (count)
    Count = Count + 1
    if Count = = 5:
        Break   # Stops the loop completely. Do not perform the subsequent else
else:   # Execute when condition is not set
    Print ("Here is Else")

2018.7.3 python