如何为数据帧动态创建不同长度的'&'过滤器

根据来自主数据帧(df)的长度可变的输入(test\u tuple¶ms),生成一个过滤数据帧(filtered\u df)。可能有数百种过滤器组合。

任职理由:

我想说的是,这里的一切都能产生预期的产出。也就是说,我不喜欢解决方案1的实现方法,在dict中创建一个虚拟的DataFrame对象,循环会依次过滤和更新这个对象。解决方案1似乎有点混乱,但我需要一些指导来实现更简洁的东西。

请求:

有没有办法使用解决方案2中所示的过滤器?

筛选器格式正确,但为字符串。是否有一种方法来产生过滤器,以便可以如图所示使用?

输入示例:

test_tuple = [('Serial Number', [12345]),
              ('Test Points', ['TestpointA', 'TestpointC']),
              ('Voltage_1', [3.0, 3.3, 3.6, 0.0]),
              ('Temperature Setpoint', [0, 60]),
              ('Slew_1', [200, 400, 800, 1600, 3200, 6400])]
params = ['sn', 'tp', 'v1', 'temp', 'slew']

代码:

for i in itertools.product(*[b for _, b in test_tuple]):
     print('\n'.join(f'{a}:{b}' for a, b in zip(params, i)))
     name_params = '_'.join(f'{b}{a}' for a, b in zip(params, i)) 
     filter_t = ' & '.join(f'(self.df["{c[0]}"] == {b})' for b, c in zip(i, test_tuple))
     print(f'filter_t: {filter_t}')
     filter_l = [(c[0], b) for b, c in zip(i, test_tuple)]

筛选器的字符串格式:

filter_t: (self.df["Test Points"] == 3P3V) & (self.df["Slew_1"] == 5000)
filter_t: (self.df["Serial Number"] == 2450) & (self.df["Test Points"] == 3P3V) & (self.df["Voltage_1"] == 11.6) & (self.df["Temperature Setpoint"] == 25.0) & (self.df["Slew_1"] == 5000)

过滤器格式:

filter_l: [('Test Points', '3P3V_Edge'), ('Slew_1', 200)]
filter_l: [('Serial Number', 1234), ('Test Points', '3P3V'), ('Voltage_1', 11.6), ('Temperature Setpoint', 25.0), ('Slew_1', 200)]

filtered_df = {1: df}
for x in filter_l:
     filtered_df[1] = (filtered_df[1].loc[(filtered_df[1][f'{x[0]}'] == x[1])])

解决方案2-可能吗?:

df_filter = self.df.loc[filter_t]

过滤器示例:

df_filter = self.df.loc[(self.df['Serial Number'] == 1234) &
                        (self.df['Test Points'] == '3P3V') &
                        (self.df['Voltage_1'] == 11.6) &
                        (self.df['Temperature Setpoint'] == 25.0) &
                        (self.df['Slew'] == 200)]

最终解决方案@John Zwinck-Thx:

filter_t = ' & '.join(f'{c[0]} == "{b}"' for b, c in zip(i, test_tuple))
filtered_df = df.loc[df.eval(filter_t)]

print(f'filter_t: {filter_t}')
>>> filter_t: Test_Points == "3P3V" & Slew_1 == "5000"