如何在 python 中使用 for 循环读取多值库

Question

Assume that CSV file has this content:

Main1,Name1,Name2,Name3,Name4
Main2,NameA,NameB
Main3,Name11,Name12,Name13

When I read it as library result is following:

{'Main1': ['Name1', 'Name2', 'Name3', 'Name4'],
 'Main2': ['NameA', 'NameB'],
 'Main3': ['Name11', 'Name12', 'Name13']}

When I turn to particular item/value like a['Main3'][2] I'll get answer 'Name13' . But the values ('Name's') are unknown number and I would like to read them all individually in eg for loop. If I read like this:

for rows in a:
    print(rows)

I will get answer:

Main1
Main2
Main3

But I would like to modify code something like:

for rows in a:
    print(rows)
    for values in rows:
        print(values)

But result is erroneous. I expect to see something like this:

'Main1' 
    'Name1'
    'Name2'
    'Name3'
    'Name4'
'Main2'
    'NameA'
    'NameB'
'Main3'
    'Name11'
    'Name12'
    'Name13'

And I cannot figure out how to modify my code. Would you please help me? Thanks!

Answer 1

As you can see a is a dictionary. so you want each key and the values, So, Try this:

for k,v in a.items():
    print(k, *v, sep='\n')

Answer 2

try this:

for rows in a:
    print(rows)
    for values in a[rows]:
        print('   ',values)

Answer 3

Try to do like this.

for rows in a:
    print(rows)
    for values in a[rows]:
        print(values)