[英]Convert and Sum elements in nested lists within pandas dataframe column
I have a df column like this:我有一个这样的 df 列:
col1
[[0.73, 0.43, 0.5, 0.0], [0.39, 0.5], [0.37], [0.38, 0.51, 0.0, 0.2]]
[[0.53, 0.33, 0.2, 0.0], [0.79, 0.5], [0.96], [0.88, 0.21, 0.0, 0.0]]
The sublists can be of any size.子列表可以是任意大小。 I am trying to convert the numbers in the sublists to floats (they're strings), then create a column that sums each sublist, then divides by the number of items in the sublist我正在尝试将子列表中的数字转换为浮点数(它们是字符串),然后创建一个对每个子列表求和的列,然后除以子列表中的项目数
so sum for line 1:第 1 行的总和:
(.73 + .43 + .5 + 0) / 4 =.415
(.39 + .5) / 2 = .445
(.37) / 1 = .37
(.38 + .51 + 0.0 + .2) / 4 = .272
for line 2:对于第 2 行:
(.53 + .33 + .2 + 0) / 4 = .265
(.79 + .5) / 2 = .645
(.96) / 1 = .96
(.88 + .21 + 0.0 + 0.0) / 4 = .272
result :结果:
new_col
[[.415],[.445],[.37],[.272]]
[[.265],[.645],[.96],[.272]]
I've tried a bunch of stuff:我尝试了很多东西:
#something like this where it creates a column of the number of elements in each sublist and then uses that to divide the sum of each number
# this didn't work - just grabbed the first lists size
df1['words_in_company_name'] = df1['children_org_name_sublists'].str.len()
#this doesn't really work - i mean it shows the numbers per list, just not sure where to go from here
for i in df1.func_scores:
length = []
for j in i:
print(j)
A一种
Just do apply
with np.mean
只需apply
np.mean
df['new_col'] = df.col.apply(lambda x : [[np.mean(y)] for y in x ])
df
Out[17]:
col new_col
0 [[0.73, 0.43, 0.5, 0.0], [0.39, 0.5], [0.37], ... [[0.415], [0.445], [0.37], [0.2725]]
1 [[0.53, 0.33, 0.2, 0.0], [0.79, 0.5], [0.96], ... [[0.265], [0.645], [0.96], [0.2725]]
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