Python---Basic

The birth of python
 : The founder of python is Guido Van Rossum (Uncle Turtle) 

Comparison of python2X and python3X:
 python2x: source code is not standardized, source code is confusing, there are many repeated codes, python2x: the default encoding method ascii, python2X does not support Chinese , display the first line of Chinese to add: - * - encoding: utf - 8 - 
*- 
python3x: Reorganize the source code, source code specification, beautiful, clear, simple 
variables: 
# Variable: Store the intermediate results of the calculation for subsequent code use . 
Variable setting rules: 
1. It must be any combination of letters, numbers and underscores. 
2. It cannot start with a number. 
3. It cannot be a keyword in python. 
['and', 'as', 'assert', 'break', 'class', 'continue', 
'def', 'del', 'elif', 'else', 'except', 'exec', 
' finally', 'for', 'from', 'global', 'if', 'import', 
'in', 'is', 'lambda', 'not', 'or', 'pass', 'print' , 
'raise', 'return', 'try', 'while', 'with', 'yield'] 
4, the variable cannot be Chinese. 
5, the variable can not be too long. 
6. Variables are descriptive. 
AgeOfOldboy = 56
NumberOfStudents = 80 
# underscore 
age_of_oldboy = 56 
number_of_students = 80 

# -*- encoding: utf-8 -*- 
print('Hello China') 

print(1 + 2 + 3 + 6 + 7 + 8 + 101) 
print(( 1 + 2 + 3 + 6 + 7 + 8 + 101) * 3 / 5) 
print((((1 + 2 + 3 + 6 + 7 + 8 + 101) * 3 / 5) * 4 / 8) 
# variables: Store intermediate results of computations for use by subsequent code. 
a = 1 + 2 + 3 + 7 + 8 + 101 
b = a * 3 / 5 
c = b * 4 / 8 
print(c) 
age1 = 12 
age2 = age1 
age3 = age2 
age2 = 23 
print(age1, age2, age3 ) 
# Constant: A quantity that never changes. Variables that default to all uppercase are constants. 
# ID number 
# Notes: Help you understand other people's codes. 
# Single line comment: # '''Commented content''' """Commented content""" 
# Basic data type: 
print('This is a string'

msg = '''The bright moonlight in front of the bed 
is suspected to be frost on the ground. 
''' 
print(msg) 

# connector
 msg1 = 'old boy education' 
msg2 = 'is the best training institution' 
print(msg1 + msg2) 
msg ​​= 'strong' 
print(msg * 8) 

# bool value True False two State: determine the authenticity of the code. 
print(3 > 2) 
print(3 > 4) 
print('True') 
print(True) 

# Determine what data type this object is type() 
print('True', type('True')) 
print(True, type(True)) 
''' 
name=input('Please enter your name:') 
age=input('Please enter your age:') 
print(name,age,type(name),type(age)) 
''' 

# if 
# single if
 ''' 
print(111) 
if 3>2:





if name == 'Your Highness': 
      print('Old iron, no problem') 
else: 
      print('If you are sick....') 


#if elif ... 
num =int(input('Please input your Choice: ')) #str--->int str All consist of numbers 
if num == 4: 
      print('I will have lunch') 
elif num == 5: 
      print('I will have dinner') 
elif num == 6: 
      print('Healthcare, go') 


#if elif ... else 
num =int(input('Please enter your choice:')) #str--->int str All consist of numbers 
if num = = 4: 
      print('Lunch, please') 
elif num == 5: 
      print('Dinner, please') 
elif num == 6: 
      print('Health care, let's go') 
else:   
      print('Give you a chance I can't catch it....') 


#Nested
 num1=input('Please enter a number') 
if num1 =='3': 
      num2=input('Please enter a number:')
      if num2 == '5': 
            print('You can guess right') 
      else: 
            print('Keep trying') 

score = int(input("input score")) 
if score>100: 
   print("I wipe, The highest score is 100...") 
elif score>=80: 
   print("B") 
elif score >= 90: 
   print("A") 
elif score >= 60: 
   print("C") 
elif score >= 40 : 
   print("D") 
else: 
   print("Too stupid...E") 

#while loop #while 
condition: 
# Result 

while True: 
      print('Serve the country with loyalty') 
      print('Pink memories') 
      print( 'cool') 
      flag=False 

flag = True 
while flag: 
      print('Serve the country with loyalty') 
      print('Pink memories')
      print('凉凉')
      flag=False
      print('第一次')

count = 1
flag = True
while flag:
      print(count)
      count=count+1   #count +=1
      if count ==101:
            flag=False

count = 1
while count<101:
      print(count)
      count=count +1
count = 0
while count<101:
      if count%2 ==0:
            print(count)
      count=count+1

#break  continue  打断循环

while True:
      print(111)
      print(222)
      break
      print(333)
print(666)


while True:
      print(111)
      print(222)
      continue
      print(333)
print(666)
'''

# break while 循环  计算出1+2+3+4....+100
count = 1
sum = 0
while True:
    sum = sum + count
    count = count + 1
    if count == 101: break
print(sum)