迴圈

for 迴圈

range

one_to_hundred_list = range(1, 101)
print(list(one_to_hundred_list))
summation = 0

out:

[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, 100]

索引值從1到100

不帶索引值的寫法

number = range(1, 101)

summation = 0

for number in number:

    summation += number

print(summation)

out:

5050

len
number = range(1, 101) 

length = len(number) 

print(length)
print(list(range(length)))

out:

100 

[0, 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]

帶索引值的寫法

number = range(1, 101)
summation = 0
for i in range(len(number)):
    summation += number[i]

print(summation)
print(i)

out:

5050

99

while 迴圈

number = range(1, 101)
summation = 0
i = 0
while i < len(number):
    summation += number[i]
    i += 1

print(summation)
print(i)

無限迴圈

while True

while 迴圈停止寫法
number = range(1, 101)
summation = 0
i = 0
while(i < len(number)):
    i += 1

print(i)