我是python的初学者，只是学习如何编写函数。我有一个权重和性别列表，正尝试根据性别标准将其拆分以创建两个新列表。使用for循环，到目前为止，我已经取得了成功：
df = pd.read_csv('brainweight.csv')
w = list(df['Weight'])
s = list(df['Sex'])
female_weight = []
male_weight = []
for sex, weight in zip (s, w):
if sex == 'f':
female_weight.append(weight)
else:
male_weight.append(weight)
我应该如何将此for循环修改为变量= m / f（性别）的函数？
df = pd.read_csv('brainweight.csv')
w = list(df['Weight'])
s = list(df['Sex'])
def list_by_gender():
females = []
males = []
for sex, weight in zip (s, w):
if sex == 'f':
females.append(weight)
else:
males.append(weight)
return males,females
male_list,female_list=list_by_gender()
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