如何使用bool值计算列中的行？

Question

我有一个数据框users，其中包含三列id，username和password。

我正在尝试计算password中少于8个字符数的行数。 我的代码：

# Calculating the length of user's passwords
users['length'] = users.password.str.len()

# Flagging the users with too short passwords`

users['too_short'] = pd.cut(users['length'], bins=[0,7,300], labels=[True,False])

print (users[users['too_short'].any(1)])

# Counting and printing the number of users with too short passwords
print(users['too_short'].count())

# Taking a look at the 12 first rows
users.head(12)

它出现以下错误：

TypeError: Categorical cannot perform the operation any

列too_short的值为True或False。我试图找到一种方法来计算此列中基于布尔值的行数，但没有运气。

Answer 1

试试这个：

users['too_short'] = users['length'] < 7

print(users[users['too_short']])
print(users['too_short'].count())