Python切片(%s)

问题描述

    s = 'gfdhbobobyui'
    bob = 0
    for x in range(len(s)):
         if x == 'bob':
             bob += 1
    print('Number of times bob occurs is: ' + str(bob))

试图编写计算"bob"在%s中出现的次数的代码，但由于某些原因，这始终为"bob"的数量输出0。

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解决方案

在这里，尝试这个，手工制作：)

for i, _ in enumerate(s): #i here is the index, equal to "i in range(len(s))"
    if s[i:i+3] == 'bob': #Check the current char + the next three chars.
        bob += 1
print('Number of times bob occurs is: ' + str(bob))

演示

>>> s = 'gfdhbobobyui'
>>> bob = 0
>>> for i, v in enumerate(s): #i here is the index, equal to "i range(len(s))"
    if s[i:i+3] == 'bob': #Check the current char + the next two chars.
        bob += 1


>>> bob
2

希望这能有所帮助！