2020-05-26
python list 妙用記錄一下
原本將 k 這個 list 當其中元素 符合的放入 d 這個 list
d=[]
for i in k:
if i.is_displayed():
d.append(i)
改成這樣 ,夠簡單吧 ….
d = [i for i in k if i.is_displayed()]
還有這樣的 字串處理
def count_vowels(s):
num_vowels = 0
for char in s:
if char in 'aeiouAEIOU':
num_vowels = num_vowels + 1
return num_vowels
我把它改成這樣一行會不會太誇張了 ….
def count_vowels(s): return len([char for char in s if char in 'aeiouAEIOU'])
可試試 放入字串呼叫 count_vowels 計算出母音 兩個是相同的結果 …
print (count_vowels('test'))
1
這個寫法直接看 True, False … 然後 SUM 加起來 … 這也行簡單 ….
def count_vowels(s): return sum([char in 'aeiouAEIOU' for char in s])
老外老師 教我用 lambda function 這樣更簡單
count_vowels = lambda s : len([char for char in s if char in 'aeiouAEIOU'])
count_vowels = lambda s : sum([char in 'aeiouAEIOU' for char in s])