如何计算字符串中字符出现的次数?
如。“a”在“Mary had a little lamb”中出现了4次。
如何计算字符串中字符出现的次数?
如。“a”在“Mary had a little lamb”中出现了4次。
当前回答
Python 3
有两种方法可以做到这一点:
1)内置函数count()
sentence = 'Mary had a little lamb'
print(sentence.count('a'))`
2)不使用函数
sentence = 'Mary had a little lamb'
count = 0
for i in sentence:
if i == "a":
count = count + 1
print(count)
其他回答
python - 3. x:
"aabc".count("a")
Str.count (sub[, start[, end]]) 返回子字符串sub在范围[start, end]中不重叠出现的次数。可选参数start和end被解释为片表示法。
myString.count('a');
更多信息请点击这里
你可以使用.count():
>>> 'Mary had a little lamb'.count('a')
4
你可以使用循环和字典。
def count_letter(text):
result = {}
for letter in text:
if letter not in result:
result[letter] = 0
result[letter] += 1
return result
Str.count (sub[, start[, end]]) 返回子字符串sub在范围[start, end]中不重叠出现的次数。可选参数start和end被解释为片表示法。
>>> sentence = 'Mary had a little lamb'
>>> sentence.count('a')
4