1-python Getting Started 1

Memory management: After the Python variable is re-assigned, the corresponding memory address will change

Reference count

Del is unbound

Memory address multiplexing

>>> x=1>>> id(x)9310240>>> x=2>>> id(x)9310272>>> y=1>>> id(y)9310240

String Formatting control characters

print(‘用户名是： %s 密码是： %s‘ %)

Print with while loop 1 2 3 4 5 6 8 9 10

x = 1print(‘Now, Print the numbers: ‘, end=‘ ‘)while x < 11:    print(x, end=‘ ‘)    if x == 6:        x += 2        print("  ", end=‘‘)    else:        x += 1

Method Two

print(‘\n‘)x = 0while x < 10:    x += 1    if x == 7:        continue    print(x, end=‘ ‘)

Ask for 1-100 and

print(‘\n‘)y = 1sum = 0while y < 101:    sum += y    y += 1print(‘1-100的所有数的和是：‘, sum)print(‘\n‘)

Ask for all the even numbers within 1-100

print(‘100以内所有的偶数： ‘, end=‘‘)for i in range(1, 101):    if i % 2 == 0:        print(i, end=‘ ‘)

Ask for an odd number within 100

print(‘\n‘)print(‘100以内所有的奇数： ‘, end=‘ ‘)for ii in range(1, 101):    if ii % 2 != 0:        print(ii, end=‘ ‘)print(‘\n‘)

Beg 1-2+3-4+5 ... 99 of all numbers of the and

sum = 0for i in range(1, 100):    if i % 2 == 0:        sum -= i        print(‘-‘, i, end=‘‘)    else:        sum += i        print(‘+‘, i, end=‘‘)print(‘=‘, sum)

User Login (three chance retry)

username = (‘cx2c‘)password = (‘cx2c‘)for i in range(1,4):    user=input(‘Please Input Your Name: ‘)    pasw=input(‘Please Input Your Password: ‘)    if username == user and password==pasw:        print(‘Login in successful‘)        break    else:        print(‘The %sth time False,Try Again‘ %i)

Print results

Now, Print the numbers:  1 2 3 4 5 6   8 9 10 1 2 3 4 5 6 8 9 10 1-100的所有数的和是： 5050100以内所有的偶数： 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58 60 62 64 66 68 70 72 74 76 78 80 82 84 86 88 90 92 94 96 98 100 100以内所有的奇数：  1 3 5 7 9 11 13 15 17 19 21 23 25 27 29 31 33 35 37 39 41 43 45 47 49 51 53 55 57 59 61 63 65 67 69 71 73 75 77 79 81 83 85 87 89 91 93 95 97 99 + 1- 2+ 3- 4+ 5- 6+ 7- 8+ 9- 10+ 11- 12+ 13- 14+ 15- 16+ 17- 18+ 19- 20+ 21- 22+ 23- 24+ 25- 26+ 27- 28+ 29- 30+ 31- 32+ 33- 34+ 35- 36+ 37- 38+ 39- 40+ 41- 42+ 43- 44+ 45- 46+ 47- 48+ 49- 50+ 51- 52+ 53- 54+ 55- 56+ 57- 58+ 59- 60+ 61- 62+ 63- 64+ 65- 66+ 67- 68+ 69- 70+ 71- 72+ 73- 74+ 75- 76+ 77- 78+ 79- 80+ 81- 82+ 83- 84+ 85- 86+ 87- 88+ 89- 90+ 91- 92+ 93- 94+ 95- 96+ 97- 98+ 99= 50Please Input Your Name: cx2cPlease Input Your Password: ccFalsePlease Input Your Name: cx2cPlease Input Your Password: cx2cLogin in successful

Getting started with 1-python 1