I'm reading a existing excel file by using openpyxl package and trying to save that file it, and it got saved but after opening that excel file no data is present. I used the following code and my requirement is to open the file in use_iterators = True mode only
from openpyxl import load_workbook
wb = load_workbook(filename = 'large_file.xlsx', use_iterators = True)
ws = wb.get_sheet_by_name(name = 'big_data')
for row in ws.iter_rows():
for cell in row:
print cell.internal_value
wb.save("large_file.xlsx")
can u guys show how to save the file and close the file after saving with out losing the data
Try loading with use_iterators = False, as use_iterators = True loads the data information differently, such that it may not contain all the information you wish to save.
Openpyxl writes and entirely new excel file based on the information it has read in, so it's not like you make a small change and just update the file. (This also means if certain features aren't supported in openpyxl (such as VB macros), these won't exist in the file you've saved.)
Related
I am getting an error when saving information in an excel sheet, I carry out the exercise of loading the workbook and I specify the sheet in which I will save the information and finally I use the .save method, this effectively saves the information I want but leaves me the raw file, as shown in the images
I am using version: openpyxl 3.0.10
def AsignacionUEM():
print("Cargando libro")
lPCartera = openpyxl.load_workbook("D:/PLANTILLA/PLANTILLA.xlsm",read_only = False, keep_vba = True)
print("Cargando hoja")
hPCartera = lPCartera.worksheets[10]
print("Agregando registros")
for row in expAsig:
hPCartera.append(row)
print("Guardando excel . . .")
lPCartera.save("D:/PLANTILLA/PLANTILLA_Envio.xlsm")
lPCartera.close()
*** Excel file with the formats before manipulating it with openpyxl ***
My Excel before
Excel file as a result of having manipulated it with openpxyl, this does save the information, but it leaves it without formats.
My Excel later
enter image description here
I have an excel file where the first four rows contain some header text and the actual dataset starts from row 4. I am trying to build a simple function that reads the excel file and outputs the same excel file after deleting the first 4 rows.
This is what my code looks like before I put it into a function.
import pandas as pd
from openpyxl import load_workbook, Workbook
wb = load_workbook('FILEPATH/excel.xlsx')
ws = wb['Sheet1']
ws = ws.delete_rows(0,4)
wb.save(r"FILEPATH/deleted_row.xlsx")
When I run the code it executes the file properly but when I try to open the excel file it give me errors and says that the file is corrupted. A point to note is that the excel file has some formatting on the rop rows. Is that what is causing some issues?
Any help is appreciated.
EDIT: This is what the errors look like and the file does not open.
In openpyxl, the first row should be 1, not 0. So, if you are looking to delete the first 4 rows, you should change the delete_row() from
ws = ws.delete_rows(0,4)
to
ws = ws.delete_rows(1,4)
I created one excel file and wrote something in it. I am trying to read that file through pandas - dataframe, but I am getting error
XLRDError: Unsupported format, or corrupt file: Expected BOF record
Code -
import pandas as pd
a = open("D:\\Joseph\\abcsaa.xlsx","a")
a.write("Hello all")
p = pd.read_excel("D:\\Joseph\\abcsaa.xlsx")
p
Thanks for the answers. I need to store tick data in a excel and then read it through dataframe.
What is the use of open function in python for excel file if I have to use other modules for this ?
Excel file cannot be created with inbuilt python open function. You have to use openpyxl package to read and write excel files.
Some besic operations using openpyxl
import openpyxl
# Open Workbook
wb = openpyxl.load_workbook(filename='example.xlsx', data_only=True)
# Get All Sheets
a_sheet_names = wb.get_sheet_names()
print(a_sheet_names)
# Get Sheet Object by names
o_sheet = wb.get_sheet_by_name("Sheet1")
print(o_sheet)
# Get Cell Values
o_cell = o_sheet['A1']
print(o_cell.value)
o_cell = o_sheet.cell(row=2, column=1)
print(o_cell.value)
o_cell = o_sheet['H1']
print(o_cell.value)
# Sheet Maximum filled Rows and columns
print(o_sheet.max_row)
print(o_sheet.max_column)
Install this if you don't already have it.
pip install XlsxWriter
Code:
import xlsxwriter
workbook = xlsxwriter.Workbook("D:\\Joseph\\abcsaa.xlsx")
worksheet = workbook.add_worksheet()
worksheet.write('A1', 'Hello world')
workbook.close()
XLsxWriter can do a lot and has great documentation here.
If the file already exists, open it the first time with
a = pd.read_excel('path/aabcsaa.xlsx')
Else, create a pandas dataframe with
a = pd.DataFrame(data)
and then save it using
pd.to_excel('path/aabcsaa.xlsx')
You opened your file in append mode ("a"). If you want to read it with read_excel by passing the filename, you need to close the file before:
a.close()
And the content of the file needs to be in valid excel format.
I have a problem when I'm trying to save and than read excel file in python. So this is my function:
import openpyxl
import xlrd
from xlutils.copy import copy
import pandas as pd
def write_excel():
wb = openpyxl.load_workbook('8de69ccb60047ce5.xlsx')
sheet = wb.active
sheet['D18'] = 3
wb.save('8de69ccb60047ce5.xls')
df1 = pd.read_excel('8de69ccb60047ce5.xls', sheet_name='Лист1', header=None, skiprows=1, usecols="H,I")
print(df1)
workbook = xlrd.open_workbook('8de69ccb60047ce5.xls')
worksheet = workbook.sheet_by_index(0)
print(worksheet.cell(17, 8).value)
print(worksheet.cell(18, 8).value)
I'm changing cell D18, saving file and than trying to read other cells that has formulas but I get nothing (also cell without formulas read correctly).
But if I open file manually and save it in Excel that lines of code read those cells correctly.
The problem is this line wb.save('8de69ccb60047ce5.xls'). It saves changes in file but it doesn't saves file correctly (I don't know how to discribe it). How can I read cell with formula after changing the file in python?
Save a file as sample_book.xlsx with save function.
wb.save(filename = 'sample_book.xlsx')
For more info check out this link: https://www.soudegesu.com/en/post/python/create-excel-with-openpyxl/#save-file
I have an xlsm file and I have come across various methods to modify the file by creating a new file using openpyxl or xlw. Is there any way that I can modify my current file without having to create a new one everytime in the process?
from openpyxl import workbook
wb = openpyxl.load_workbook(filename = 'filename', read_only = False, keep_vba = True)
sheet = wb.get_sheet_by_name('UI')
wb.save('outfile.xlsm')
However, I do not want to create a new file each time I run the code and just want to modify my current file but openpyxl is not compatible with .xlsm type files?
Is there any way to do this?
OpenPyXL 2.6.2 does support xlsm files. Just overwrite your existing workbook.
import openpyxl
wb = openpyxl.load_workbook(filename = 'filename.xlsm', read_only = False, keep_vba = True)
sheet = wb['UI']
wb.save('filename.xlsm')