[英]Pandas: Is there a way to iterate through a dataframe and create new dataframes using multiple conditions?
我需要拆分 dataframe 以便我可以使用完整 dataframe 中的空间数据创建新文件。
我有一个看起来像这样的 dataframe:
我想使用多个条件创建一些新的数据框
我希望最终得到一堆具有以下条件的数据帧,例如:
Z_year = 2020, Z_month = 5, Z_group = 'weekday', time_range = '08:00 to 12:00'
Z_year = 2020, Z_month = 5, Z_group = 'weekday', time_range = '12:00 to 18:00'
Z_year = 2020, Z_month = 5, Z_group = 'weekday', time_range = '18:00 to 01:00'
Z_year = 2020, Z_month = 5, Z_group = '周末', time_range = '08:00 to 12:00'
Z_year = 2020, Z_month = 5, Z_group = '周末', time_range = '12:00 to 18:00'
Z_year = 2020, Z_month = 5, Z_group = '周末', time_range = '18:00 to 01:00'
Z_year = 2020, Z_month = 8, Z_group = 'weekday', time_range = '08:00 to 12:00'
Z_year = 2020, Z_month = 8, Z_group = 'weekday', time_range = '12:00 to 18:00'
Z_year = 2020, Z_month = 8, Z_group = 'weekday', time_range = '18:00 to 01:00'
...
Z_year = 2021, Z_month = 11, Z_Group = '周末', time_range = '18:00 to 01:00'
等等
直到所有组合完成。
有没有办法遍历我的 dataframe 来做到这一点?
目标列是(年、月、组和时间范围),每个列的唯一值是:(2020、2021)、(5、8、11)、('weekday'、'weekend')和( 08:00 至 12:00、12:00 至 18:00、18:00 至 01:00)
...
#This is used to find unique values for target collumns
year_list = df['Z_year'].unique()
#Creating a new dataframe using only target values
a = df.loc[(df['Z_year'] == 2020) & (df['Z_month'] == 5) & (df.loc['Z_group'] == 'weekday') & (df.loc['time_range'] == '08:00 to 12:00')]
...
谢谢你的帮助!
您可以像这样遍历 dataframe:
cols, rows = df.shape
for x in range(cols):
print(df[x:x+1])
您可以将 select 和 append 候选列表转换为新的 dataframe。
我建议使用 for 循环和字典,以便将每个 dataframe 保存为由条件组合组成的谱号
dic = {}
for a in [2020,2021]:
for b in [5, 8, 11]:
for c in ['weekday', 'weekend']:
for d in ['08:00 to 12:00', '12:00 to 18:00', '18:00 to 01:00']:
idf = str(a)+str(b)+c+d
dic[idf] = df.loc[(df['Z_year'] == a) & (df['Z_month'] == b) & (df.loc['Z_group'] == c) & (df.loc['time_range'] == d)]
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