如何将多值的单行拆分为多个单行

Question

我有一个CSV文件，其中的单个“ id”具有多个复杂的“值”，并且 我希望多个值相对于其“ id”分成不同的行。

我的CSV文件：

# To read df1=pandas.read_csv('krish.csv',encoding="ISO-8859-1")
# File have data even like 1.50% (P,KR,AU) 0.2¢/kg (AX,AU)
id  value
100.3   Free (A+,BH,CA) 0.1¢/kg (AX)
200.1   Free (MA, MX,OM)
321.5   Free (BH,CA) 1.70% (P) 7% (PE) 12.3% (KR)

我想要以上输入的输出：

关于我的代码以及尝试的内容的输出

Answer 1

I'm pretty sure there are more efficient/elegant ways, but this should work

def split_elements(s):
    elements = s[s.find('(')+1:-1].split(',')
    key = s[:s.find('(')]
    return ['{} ({})'.format(key, el) for el in elements]

input_data = {'values': ['Free (A+,BH,CA) 0.1¢/kg (AX)', 'Free (MA, MX,OM)', 'Free (BH,CA) 1.70% (P) 7% (PE) 12.3% (KR)'], 'ids': [100.3, 200.1, 321.5]}
df = pd.DataFrame(input_data)

temp_values = []
temp_ids = []
# iterate through rows
for idr, r in df.iterrows():
    # extract elements
    elements = [el.strip()+')' for el in r['values'].split(')') if el != '']
    # split subelements
    for element in elements:
        split_el = split_elements(element)
        temp_values.extend(split_el)
        temp_ids.extend([r['ids']]*len(split_el))
# create dataset
df1 = pd.DataFrame({'ids': temp_ids, 'values': temp_values})
df1.set_index('ids')

Which gives

ids     values
100.3   Free (A+)
100.3   Free (BH)
100.3   Free (CA)
100.3   0.1¢/kg (AX)
200.1   Free (MA)
200.1   Free ( MX)
200.1   Free (OM)
321.5   Free (BH)
321.5   Free (CA)
321.5   1.70% (P)
321.5   7% (PE)
321.5   12.3% (KR)