pandas 在 for 循环中构建熊猫数据框
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时间：2020-09-13 23:15:59 来源:igfitidea点击:
Build pandas dataframe in for loop
提问by Christopher Jenkins
I have a for loop that iterates over a dataframe and calculates two pieces of information:
我有一个 for 循环，它遍历数据帧并计算两条信息：
for id in members['id']
x = random_number_function()
y = random_number_function()
I'd like to store id, x and y in a dataframe that is built one row at a time, for each pass through the for loop.
我想将 id、x 和 y 存储在一次构建一行的数据帧中，每次通过 for 循环。
回答by iayork
Here's an example of using a dict to build a dataframe:
这是使用 dict 构建数据框的示例：
dict_for_df = {}
for i in ('a','b','c','d'): # Don't use "id" as a counter; it's a python function
x = random.random() # first value
y = random.random() # second value
dict_for_df[i] = [x,y] # store in a dict
df = pd.DataFrame(dict_for_df) # after the loop convert the dict to a dataframe
