I have two files: file1.txt and file2.txt. I would like to only display the lines in result2.txt that are new / different from those in result1.txt.
I do this in bash using the following command:
diff file1.txt file2.txt | grep -E "^>" | sed 's/^..//'
Is this achievable using Python (without calling an OS command)?
See difflib a Python library for exactly this
Go through the program and it is one of the lucid code, which takes advantage of a user defined function to look for changes between two files. ~~ do leave the comment if there is any queries.
def copy(name1 = input("Enter The Initial File Name : "), name2 = input("Enter The Change File Name : "), name3 = input("Enter The Nanme of The Output File : ")):
#initialisation from user if no parameter is provided
import os #to remove redundant output file, can be not used also
while True:
try:
f = open(name1,"r+") #'r+' because to read and write
s = open(name2,"r+")
o = open(name3,"w")
except IOError:
print("File not found !!!!")
break
while True:
char1 = f.read(1)
char2 = s.read(1)
if (char1 == "" and char2 == ""):
break #if reached end of file
if(char2 == ""):
o.write(char1) #writing for difference in blank space
elif(char1 == ""):
o.write(char2) #writing for difference in blank space
elif(char2 is not char1):
o.write(char2) #compare and write
f.close()
s.close()
o.close()
print("The Changes Copied to",name3)
break
copy()
