Metodo Python File writelines ()

Descrizione

Metodo file Python writelines()scrive una sequenza di stringhe nel file. La sequenza può essere qualsiasi oggetto iterabile che produce stringhe, in genere un elenco di stringhe. Non esiste alcun valore di ritorno.

Sintassi

Di seguito è riportata la sintassi per writelines() metodo -

fileObject.writelines( sequence )

Parametri

  • sequence - Questa è la sequenza delle corde.

Valore di ritorno

Questo metodo non restituisce alcun valore.

Esempio

L'esempio seguente mostra l'utilizzo del metodo writelines ().

This is 1st line
This is 2nd line
This is 3rd line
This is 4th line
This is 5th line
#!/usr/bin/python'

# Open a file in witre mode
fo = open("foo.txt", "rw+")
print "Name of the file: ", fo.name

# Assuming file has following 5 lines
# This is 1st line
# This is 2nd line
# This is 3rd line
# This is 4th line
# This is 5th line

seq = ["This is 6th line\n", "This is 7th line"]
# Write sequence of lines at the end of the file.
fo.seek(0, 2)
line = fo.writelines( seq )

# Now read complete file from beginning.
fo.seek(0,0)
for index in range(7):
   line = fo.next()
   print "Line No %d - %s" % (index, line)

# Close opend file
fo.close()

Quando eseguiamo il programma sopra, produce il seguente risultato:

Name of the file:  foo.txt
Line No 0 - This is 1st line

Line No 1 - This is 2nd line

Line No 2 - This is 3rd line

Line No 3 - This is 4th line

Line No 4 - This is 5th line

Line No 5 - This is 6th line

Line No 6 - This is 7th line