python exercise 1

# 1. Determine the True and False of the following logic statements.
# 1）,1 > 1 or 3 < 4 or 4 > 5 and 2 > 1 and 9 > 8 or 7 < 6
#             f      t             f       t       t
# True
# 2）(not 2 > 1 and 3 < 4 or 4 > 5 and 2 > 1 and 9 > 8 or 7 < 6)
# False
# f                    f             f              t
# 2. Find the value of the following logic statement.
# 1),8 or 3 and 4 or 2 and 0 or 9 and 7)

# 8
# 2),0 or 2 and 3 and 4 or 6 and 0 or 3

# 3. What is the result of the following?
# 1)、6 or 2 > 1
# 6
# 2)、3 or 2 > 1
# 3
# 3)、0 or 5 < 4
# False
# print(3 > 1 and 2 or 2 < 3 and 3 and 4 or 3 > 2)
# 4)、5 < 4 or 3
# 3
# 5)、2 > 1 or 6
# True
# 6)、3 and 2 > 1
# True
# 7)、0 and 3 > 1
# 0
# 8)、2 > 1 and 3
#3
# 9)、3 > 1 and 0
#0
# 10)、3 > 1 and 2 or 2 < 3 and 3 and 4 or 3 > 2
# 2
# 4. Briefly describe variable naming conventions
# Variables consist of numbers, letters, and underscores and cannot start with numbers
# cannot be a python keyword
# cannot be Chinese
# Variables are descriptive
# 5. name = input(”>>>”) What data type is the name variable?
# string
# 6. The basic structure of an if conditional statement?
#if condition:
# result
# 7. Basic structure of while loop statement?
# while condition:
# result:
# 8. Write code: Calculate the sum of all numbers except 88 in 1 - 2 + 3 ... + 99?
# i=1
# sum=0
# while i <100:
#     if i ==88:
#         i = i + 1
#         continue
#
# elif i% 2 == 0:
#         sum-=i
#     else:
#         sum+=i
#     i+=1
# print(sum)



# 9. The user logs in (three chances to make mistakes) and displays the remaining number of mistakes each time they make a mistake (hint: use string formatting)
# i = 1
# while i<4:
#     name = input('please enter your username')
#     key = input('please enter your password')
#     if name=='zhujun' and key=='abcdefg' :
#         print('SUCCEED')
#         break
#     else:
#         print('WRONG!You have  %d of 3 chances'%(3-i))
#     i +=1
#
# i=1
# while i<4:
#     name = input('please enter your username')
#     psd= input('please enter your password')
#     if name=='zhujun'and psd=='123456':
#         print('succeed')
#         break
#     else:
# print('wrong you still have %d chances'%(3-i))
#     i+=1

# 10. Briefly describe the relationship between ascii, unicode, and utf-8 encoding?
# Use ascii code at the beginning, there are a total of 256 possibilities, not enough, just create a universal code (uncoide) on the basis of ascii code, uncoide starts with 16 digits, but Chinese cannot be satisfied, upgrade to 32 digits,
# But it is too resource-intensive, upgrade to utf-8
#
# 11. Briefly describe the relationship between bits and bytes?
# 8 bits a byte
# 12. How many bytes does "old boy" use UTF-8 encoding? How many bytes does it take to use GBK encoding?
#9,6
# 13. Requirements for making interesting template programs: wait for the user to input name, location, hobbies, according to the user's
# Arbitrary reality for names and hobbies, such as: dear and lovable xxx, most like to be in xxx place
# name=input('>>>Please enter your name')
# location=input('>>>Please enter your location')
# hobbie=input('>>>Please enter your hobbies')
# msg='Dear %s, I like %s, in %s' %(name,hobbie,location)
# print(msg)

#
# 14. Wait for user input,
# Detect whether the user input contains sensitive characters? if it exists
# Sensitive characters prompt "Please re-enter if there are sensitive characters", and allow the user to re-enter and print. sensitive
# Sensitive characters: "little pink", "big hammer"
# while 1:
# a=input('>>>Please enter your comment')
# if a.find('Little Pink')!=-1 or a.find('Big Hammer')!=-1:
# print('There are sensitive characters, please re-enter')
#         continue
#     else:
# print('input is correct')
#         break
# while 1:
# comment=input('Please enter your comment')
# s1='Little pink tender'
# s2='Big Hammer'
#     if s1  in comment:
# print('Contains sensitive characters, please re-enter')
#     elif s2 in comment:
# print('Contains sensitive characters, please re-enter')
#     else:
# print('input is correct')
#         break
# 15. Single-line and multi-line comments?
# Single line comment: #
# Multi-line comments: '' or ''' ''' or '' ''
# 16. Briefly describe the difference between Python 3 and Python 2 that you know?
# python2: There are bad habits in other languages, there is a lot of repeated code
# python3: simple, clear, beautiful
# Print function: python2 does not need parentheses, python3 must add parentheses
# 17. Look at the code writing result:
# a = 1>2 or 4<7 and 8 == 8
# print(a)
# True