[英]Count occurrences of char in a single string
string = input(" ")
count = string.count()
print(string + str(count))
需要使用for循環來獲取output:ll2a1m1a1
使用itertools
中的groupby
>>> from itertools import groupby
>>> s = 'llama'
>>> [[k, len(list(g))] for k, g in groupby(s)]
[['l', 2], ['a', 1], ['m', 1], ['a', 1]]
如果您確實想要您詢問的 output ,請嘗試以下操作,並按照@DanielMesejo 的建議,使用sum(1 for _ in g)
而不是len(list(g))
:
>>> from itertools import groupby
>>> s = 'llama'
>> groups = [[k, sum(1 for _ in g)] for k, g in groupby(s)]
>>> ''.join(f'{a * b}{b}' for a, b in groups)
'll2a1m1a1'
這適用於您想要的任何單詞,假設這個詞是“發生”,所以
>>> from itertools import groupby
>>> s = 'happen'
>> groups = [[k, sum(1 for _ in g)] for k, g in groupby(s)]
>>> ''.join(f'{a * b}{b}' for a, b in groups)
'h1a1pp2e1n1'
看,你必須解釋更多,這會循環並計算每個字母的次數並將其打印出來。
greeting = 'llama'
for i in range(0, len(greeting)):
#start count at 1 for original instance.
count = 1
for k in range(0, len(greeting)):
# check letters are not the same position letter.
if not k == i:
#check if letters match
if greeting[i] == greeting[k]:
count += 1
print(greeting[i] + str(count))
更基本的方法:
string = 'llama'
def get_count_str(s):
previous = s[0]
for c in s[1:]:
if c != previous:
yield f'{previous}{len(previous)}'
previous = c
else:
previous += c
# yield last
yield f'{previous}{len(previous)}'
print(*get_count_str(string ), sep='')
output:
ll2a1m1a1
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