File object to create read and write files in Python

We can read , write ,append or create file by using file handler object in Python. Here are the methods we will be using for managing files.

Python file handling methods with different modes to read write & append data in text & binary mode

Mode	Details
read()	Reading content of a file
readable()	Check if file is readable or not
write()	Write content to file
seek()	Move the file pointer to different location inside the file
seekable()	Check if file is seekable or not
tell()	Get the position of the file pointer
readlines()	Getting a list from the content of a file
readline()	Reading line of data from a file
truncate()	Resize a file upto the input bytes
writable()	Check if the file is writable or not
writelines()	Writing list to file

Reading CSV file

We can use one Comma Separated Values( CSV ) file and use one of the column as options for a combobox.
Download the sample student CSV file from here

We used append method to add elements to the list.

names=[]
path="D:\\my_data\\student.csv" # sample CSV file, use your path
fob=open(path,)
headings = next(fob) # removing header row
for rec in fob:
  student=rec.split(',')
  print(student)
  names.append(student[1]) # name added

Using csv library we can create a list.

import csv
file = open('D:\student.csv') # Path of CSV data file, use your path 
csvreader = csv.reader(file)
l1 = []
l1 = next(csvreader) # column headers as first row 
r_set = [row for row in csvreader]

Read , add changes and then write to file

path='D:/my_dir1/plus2net/python/list.php' # path of file to update
fob=open(path,'r') # Open in read mode 
data=fob.read() # collect data 
fob.close() # close file object 
#print(data)
data=data.replace('\n\n','\n') # replace double line break with single
#print(data)
with open(path, "w") as f: # Open in Write mode 
    f.write(data) # rewrite data

os operating system interfaces

os module provides access to operating system in Python. This is a already installed module in our Python system.
More on os module
Read the practice question with solution on how to create csv file using
user inputs and then creating dictionary by reading data from the csv file.
Finally use the dictionary to create csv file.
File Append File Write

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File handling in Python

Reading CSV file

Read , add changes and then write to file

os operating system interfaces

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