我想从列表中的字符串中提取数字

Question

我有一个列表,如

 [['2 Cups Fresh breadcrumbs'], ['1/3 Cup Parmesan cheese, grated'], ['For frying  Vegetable Oil']]

我想从列表元素中获取数字,例如在获取列表之后应该看起来像这样

 [['2', 'Cups Fresh breadcrumbs'], ['1/3', 'Cup Parmesan cheese, grated'], ['','For frying  Vegetable Oil']]

我试图从列表中的字符串解析数字.

语言 - 蟒蛇

Answer 1

您可以使用re具有此模式的模块:

data = [['2 Cups Fresh breadcrumbs'], ['1/3 Cup Parmesan cheese, grated'], ['For frying  Vegetable Oil']]
pattern = '([0-9].*?)?\s(.*)'
[[item for found in re.findall(pattern, i[0]) for item in found] for i in data]
#[['2', 'Cups Fresh breadcrumbs'], ['1/3', 'Cup Parmesan cheese, grated'], ['','For frying  Vegetable Oil']]