Computer Science
( Class XII Sc )
Writing lines , words and characters from one text
file to another file
1. Reading lines from one file and write into another file starting from 's'
r=open('read.txt',"r") # open file in read mode
w=open("write.txt",'w') # open file in write mode
lines=r.readlines()
for line in lines:
if(line[0]=='s'): # write all lines start from 's' from read.txt to write.txt
w.write(line)
r.close()
w.close()
2. Write first and last line of one file into another file
r=open('read.txt',"r") # open file in read mode
w=open("write.txt",'w') # open file in write mode
lines=r.readlines()
w.write(lines[0]) # write first line
w.write(lines[-1]) # write last line
r.close()
w.close()
3. Write lines of one file into anther in reverse form
r=open('read.txt',"r")
w=open("write.txt",'w')
lines=r.readlines()
for line in lines:
w.write(line[::-1]) # write line in reverse form
r.close()
w.close()
contents of read.txt
my name is mukesh
pgt computer Science
Contents of write.txt file
hsekum si eman ym
ecneicS retupmoc tgp
4. Write only digits from one file to another
fr=open('read.txt',"r")
fw=open("write.txt",'w')
s=fr.read()
w=s.split()
for i in w:
for c in i:
if c.isdigit(): # check character for digit
fw.write(c)
fr.close()
fw.close()
Contents in read.txt
pin code 160014
Mobile no 9646648307
E=mail id: mk168in@gmail.com
Contents in read.txt
pin code 160014
Mobile no 9646648307
E=mail id: mk168in@gmail.com
Contents in write.txt file
1600149646648307168
5.Writing upper,lower case characters and other characters input by keyboard in different files
f1=open('lower.txt',"w")
f2=open('upper.txt',"w")
f3=open('other.txt',"w")
n=int(input("How many characters you want
to enter "))
for i in range(n):
ch=input("Enter
a character")
if ch.islower():
f1.write(ch)
elif ch.isupper():
f2.write(ch)
else:
f3.write(ch)
f1.close()
f2.close()
f3.close()
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