1.死循环

while 1 == 1:

print('ok')

结果是一直循环

2.循环

count = 0

while count < 10:

print(count)

count = count +1

print(error)

3.练习题

~ 使用while循环输出1 2 3 4 5 6   8 9 10

count = 1

while count <= 10 : # 或者count < 11

if count == 7:

print( ) # 也可以添加pass，什么也不执行

else:

print(count)

count = count + 1

执行结果：

1

2

3

4

5

6

8

9

10

process finished with exit code 0

~ 求1-100的所有数的和

a = 1

b = 0

while a < 101:

b = b + a

a = a + 1

print(b)

输出结果：

5050

process finished with exit code 0

~求1-100内所有的奇数

n = 1

while n < 101:

js = n % 2

if js == 0:

print( )

else:

print(n)

n = n + 1

输出结果：

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

~ 求1-100内所有的偶数

a = 1

while a < 101:

b = a % 2

if b == 0:

print(a)

else:

pass

a = a + 1

输出结果：

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

process finished with exit code 0

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