变量、常量、input、if语句

your_name = 'Jack Ma'

ARVIN_AGE = 18

# The idle boy is almost invariably poor and anxious. 单行注释

'''
这是多行注释示范
'''

"""
多行注释示范
"""

your_id = input("input your id identifier: ")
your_pwd = input("input your password: ")
print("Your id is {}, Your password is {}".format(your_id, your_pwd))

运行结果：
input your id identifier: Jack
input your password: default
Your id is Jack, Your password is default

if 10 > 8:
    print("You are right.")
 

if 10 > 20:
  print("10 is bigger than 2.")
else:
  print("10 is smaller than 2.") 

a = "jack"
if 10 > 50:
  print("10 is bigger than 5.")
elif type(a) == "str":
  print("a is a string.")
elif 20 == 20:
  print("20 is equal 20.")
else:
    print("All of them are false.")

运行结果：
20 is equal 20.
 

a = "jack"
if 10 == 20:
  print("10 is equal 20.")
if a == "jack":
  print(a ,"is the same as jack.")
if 10 == 10:
  print("10 is equal 10.")

运行结果：
jack is the same as jack.
10 is equal 10.
 

id = int(input("input your id number: "))
pwd = input("input your passwrd: ")
if id == 9:
  print("GO ON.")
  if pwd == "default":
      print("You logged in successfully.")
  else:
      print("Your password is incorrect.")
else:
  print("Your id was typed incorrectly.")