从 Excel 工作簿的每张纸中读取一个单元格并编译成一个列表（熊猫/python）

Question

I have an Excel workbook with a bunch of sheets that I want to pull the contents of cell B4 and put all of those cells into a list, not a dictionary. I'm also pulling information from other parts of each sheet but I don't think I can do both at the same time so my code looks like this:

sheets = pd.read_excel(f, sheet_name=None, index_col=None, usecols="D:G", skiprows=14, nrows=8)
cells = pd.read_excel(f, sheet_name=None, index_col=None, header=None, usecols="B", skiprows=5, nrows=0)

I then tried to convert cells into a dataframe (because each of the items in sheets is a dataframe):

cells2 = pd.DataFrame.from_dict(cells)

and I get this error:

ValueError: If using all scalar values, you must pass an index

Answer 1

I still didn't get the whole picture of your data.

But here's an approach.

---

The example of excel content I used(only one sheet).

I didn't use argument: sheet_name=None (if it only contains one sheet)

cells = pd.read_excel('example.xlsx',header=None, index_col=None, usecols="B", skiprows=5)
cells = cells.rename(columns={1:"B"}) # rename column for readability
print(cells)

Output

    B
0   1
1   4
2   2
3  10
4   1
5   4
6   3

It looks like you wanna put a series into list,

therefore we select the series, and its column name is 'B'

cells['B'].values.tolist()

Output

[1, 4, 2, 10, 1, 4, 3]

---

With multi-sheets

And we try to put every B4 of each sheet into a list.

sheet1 B4=19

sheet2 B4=11

sheet3 B4=20

sheets = pd.read_excel('example_3sheets.xlsx',sheet_name=None,header=None, index_col=None, usecols="B", skiprows=3)
print(sheets)

Output

{'sheet1':     1
0  19
1  12
2  15, 'sheet2':     1
0  11
1  17
2  13, 'sheet3':     1
0  20
1  15
2  15}

That is actually three key-value pairs, like three boxes with name on it, and what is in the box? a DataFrame ! That's why you got the error syntax, while the dict's values are not list -like content.

You can select the first dataframe by:

sheets['sheet1']

Output

    1
0  19
1  12
2  15

And check the type:

type(sheets['sheet1'])

Output

pandas.core.frame.DataFrame

Iterate for every dataframe

for key in sheets:
    print(sheets[key])

Output

    1
0  19
1  12
2  15
    1
0  11
1  17
2  13
    1
0  20
1  15
2  15

---

Finally

According to the skiprows=3 , B4 is in every dataframe 's first element, we can select by iloc

b4_in_every_sheet = []
for key in sheets:
    b4_in_every_sheet.append(sheets[key].iloc[0,0])

print(b4_in_every_sheet)

Output

[19, 11, 20]

another way with list comprehension

b4_in_every_sheet_2 = [sheets[key].iloc[0,0] for key in sheets]
print(b4_in_every_sheet_2)

Output

[19, 11, 20]

Hope it helps.