pandas read_excel在同一张纸上的多个表

Question

Is it possible to read multiple tables from a sheet excel file using pandas ? Something like: read table1 from row0 until row100 read table2 from row 102 until row202 ...

Answer 1

Assuming we have the following Excel file:

Solution: we are parsing the first sheet (index: 0 )

xl = pd.ExcelFile(fn)
nrows = xl.book.sheet_by_index(0).nrows

df1 = xl.parse(0, skipfooter= nrows-(10+1)).dropna(axis=1, how='all')
df2 = xl.parse(0, skiprows=12).dropna(axis=1, how='all')

EDIT: skip_footer was replaced with skipfooter

Result:

In [123]: df1
Out[123]:
    a   b   c
0  78  68  33
1  62  26  30
2  99  35  13
3  73  97   4
4  85   7  53
5  80  20  95
6  40  52  96
7  36  23  76
8  96  73  37
9  39  35  24

In [124]: df2
Out[124]:
   c1  c2  c3 c4
0  78  88  59  a
1  82   4  64  a
2  35   9  78  b
3   0  11  23  b
4  61  53  29  b
5  51  36  72  c
6  59  36  45  c
7   7  64   8  c
8   1  83  46  d
9  30  47  84  d

Answer 2

First read in the entire csv file:

import pandas as pd
df = pd.read_csv('path_to\\your_data.csv')

and then obtain the individual frames, for example using:

df1 = df.iloc[:100,:]
df2 = df.iloc[100:200,:]

Answer 3

I wrote the following code to identify the multiple tables automatically, in case you have many files you need to process and don't want to look in each one to get the right row numbers. The code also looks for non-empty rows above each table and reads those as table metadata.

def parse_excel_sheet(file, sheet_name=0, threshold=5):
    '''parses multiple tables from an excel sheet into multiple data frame objects. Returns [dfs, df_mds], where dfs is a list of data frames and df_mds their potential associated metadata'''
    xl = pd.ExcelFile(file)
    entire_sheet = xl.parse(sheet_name=sheet_name)

    # count the number of non-Nan cells in each row and then the change in that number between adjacent rows
    n_values = np.logical_not(entire_sheet.isnull()).sum(axis=1)
    n_values_deltas = n_values[1:] - n_values[:-1].values

    # define the beginnings and ends of tables using delta in n_values
    table_beginnings = n_values_deltas > threshold
    table_beginnings = table_beginnings[table_beginnings].index
    table_endings = n_values_deltas < -threshold
    table_endings = table_endings[table_endings].index
    if len(table_beginnings) < len(table_endings) or len(table_beginnings) > len(table_endings)+1:
        raise BaseException('Could not detect equal number of beginnings and ends')

    # look for metadata before the beginnings of tables
    md_beginnings = []
    for start in table_beginnings:
        md_start = n_values.iloc[:start][n_values==0].index[-1] + 1
        md_beginnings.append(md_start)

    # make data frames
    dfs = []
    df_mds = []
    for ind in range(len(table_beginnings)):
        start = table_beginnings[ind]+1
        if ind < len(table_endings):
            stop = table_endings[ind]
        else:
            stop = entire_sheet.shape[0]
        df = xl.parse(sheet_name=sheet_name, skiprows=start, nrows=stop-start)
        dfs.append(df)

        md = xl.parse(sheet_name=sheet_name, skiprows=md_beginnings[ind], nrows=start-md_beginnings[ind]-1).dropna(axis=1)
        df_mds.append(md)
    return dfs, df_mds