#if-elif-else
# Int (input ( 'Please enter your score:'))
grade = int (input ( 'Please enter your score:'))
if grade -ge 90:
print ( 'excellent')
Elif grade -provide 70:
print ( 'good')
elif grade -provide 60:
print ( 'pass')
else:
print ( 'fail')
'''
Multi-line comments '' ' ' ''
'''
#if used to determine the input of the user login user name and password are correct
Naming variables defined in Rule #: lowercase letters and underscore _ lowercase letters
account = 'huan'
password = '123456'
print('please input account')
user_account = input()
print('please input password')
user_password = input()
if account == user_account and password == user_password:
print('success')
else:
print('failed')
#注意：user_password = input()
# Username and password and relationships
#account == user_account and password == user_password :
if #if can also nest, but is generally not recommended nested, nested statements suggested that if the package as a function of
# Code block, indentation
if condition:
pass
elif expression:
pass
else:
pass
a = 1
b = 0
a or b