为什么在包含字符串和 NaN 的系列中出现“TypeError：'float' 类型的参数不可迭代”？

Question

For a series containing strings and NaN values, why does series.apply(not_happy)

where not_happy is defined by:

def not_happy(element):
    if 'subtring' in element:
        return True
    else:
        return False

gives the error "TypeError: argument of type 'float' is not iterable"

Answer 1

One of the values in the series you're applying the funciton on in not of str type or probably you have some missing values.

Answer 2

check the data type of your element.

def not_happy(element): if 'subtring' in str(element): return True else: return False

This will make your element string type and work.