f=open('poem.txt','r') n=open('new_poems','w') fn=open('temp_poems','w') s=f.readline() while 1: for x in s: if x=='a': print(s,end='') n.write(s) break else: fn.write(s) s=f.readline() if not s: break print("----------------------------") print("These lines were written from file: ",f.name) print("To the new file :",n.name) print("----------------------------") f.close() fn.close() f=open('poem.txt','w') fn=open('tem_poems','r') tem=fn.read() f.write(tem) print(tem) print("----------------------------") print("These lines were remain in file: ",f.name) n.close() fn.close() f.close() in this program i cannot open my file even if i have saved my file in txt !! it shows error in the first line !! please help