open file with read and write python code example
Example 1: python open and reacd file
with open('yourfile.txt','r') as f:
lines = f.readlines()
f.close()
Example 2: python file handling
with open('filename', 'a') as f: # able to append data to file
f.write(var1) # Were var1 is some variable you have set previously
f.write('data')
f.close() # You can add this but it is not mandatory
with open('filename', 'r') as f: # able to read data from file ( also is the default mode when opening a file in python)
with open('filename', 'x') as f: # Creates new file, if it already exists it will cause it to fail
with open('filename', 't') as f: # opens the file in text mode (also is defualt)
with open('filename', 'b') as f: # Use if your file will contain binary data
with open('filename', 'w') as f: # Open file with ability to write, will also create the file if it does not exist (if it exists will cause it to fail)
with open('filename', '+') as f: # Opens file with reading and writing
# You can combine these as you like with the + for reading and writing
Example 3: read and write to file python
file = open(“testfile.txt”, “r+”)
Example 4: read and write file in python
#Write a Python program to create a file of numbers by taking input from the user and then display the content of the file. You can take input of non-zero numbers, with an appropriate prompt, from the user until the user enters a zero to create the file assuming that the numbers are non-zero.
f = open ('NumFile.txt','w')
while True :
no = int(input("enter a number (0 for exit)"))
if no == 0 :
print("you entered zero(0) ....... \n now you are exit !!!!!!!!!!!")
break
else :
f.write(str(no)+"\n")
f.close()
f1 = open ('NumFile.txt','r')
print("\ncontent of file :: \n",f1.read())
f1.close()