Python：将相同的前缀添加到列表中的所有元素

Question

假设我有以下Python列表：

['7831-0', nan, '3165-0', '7831-0', '7831-1'] 

我想为上面列表中的每个元素添加相同的前缀（'ADD_'。我也想从列表中删除nan。我想要的输出列表如下：

list = ['ADD_7831-0', 'ADD_3165-0', 'ADD_7831-0', 'ADD_7831-1']

我尝试了以下代码：

prefix_ADD = 'ADD_'

new_list = [prefix_ADD + x for x in list]

但是我收到以下错误：

TypeError: must be str, not float

Answer 1

[prefix_ADD + x for x in list if not str(x) == "nan"]

是一种可以过滤掉纳米的方法

Answer 2

也许是一个不那么优雅的解决方案但是这个怎

new_list=[]
old_list = ['7831-0', nan, '3165-0', '7831-0', '7831-1']

prefix_ADD = 'ADD_'

for x in old_list:
    if x != nan:
        new_list.append(prefix_ADD + x)

print(new_list)
# ['ADD_7831-0', 'ADD_3165-0', 'ADD_7831-0', 'ADD_7831-1']

Answer 3

your_list = ['7831-0', float('nan'), '3165-0', '7831-0', '7831-1']
print(your_list)  # ['7831-0', nan, '3165-0', '7831-0', '7831-1']
prefix_ADD = 'ADD_'
new_list = [prefix_ADD + x for x in your_list if isinstance(x, str)]
print(new_list)  # ['ADD_7831-0', 'ADD_3165-0', 'ADD_7831-0', 'ADD_7831-1']