Use writelines()
e.g.
# read lines in a file
import sys
arg1 = sys.argv[1]f = open(arg1, 'r')
lines = f.readlines()
f.close()arg='out_'+arg1
FILE=open(arg,'w')for line in lines:
words = line.split(' ')
if words[1] == 'hypnos':
FILE.writelines(line)
FILE.close()
When you want to find a word in a string, use find()
e.g.
import sys
arg1 = sys.argv[1] # passing the first argumentif arg1.find("off") == -1: # if arg1 does not contain "off"
# do something
else:
# do something
Use readlines()
For example,
arg = "filename" f = open(arg, 'r') lines = f.readlines() f.close()
>>>import os
>>>os.chdir(‘..’)
>>>os.chdir(‘/home/weboom/’)
Then,
import datetime
If you don’t want to refer to the elements of a collection by their position number but prefer some other type of object as a key,
use a python dictionary
———–
e.g.,
>>> tel = {'jack': 4098, 'sape': 4139} >>> tel['guido'] = 4127 >>> tel {'sape': 4139, 'guido': 4127, 'jack': 4098} >>> tel['jack'] 4098 >>> del tel['sape'] >>> tel['irv'] = 4127 >>> tel {'guido': 4127, 'irv': 4127, 'jack': 4098} >>> tel.keys() ['guido', 'irv', 'jack'] >>> 'guido' in tel True
Python tuple
consist of a number of objects which can be referenced by their position number within the object.
———
e.g.,
fruit = (“Apple”,”Banana”,”Cherry”,”Fig”,”Grapefruit”)
__unicode__
is for displaying objects.
———–
For example,
>>>p = Card.objects.create(name=’Hot Pot’, city=’San Diego’)
>>>card_list = Card.objects.all()
>>>card_list
[<Card: Card object>]
without __unicode__, you will see just “Card object”
if you define __unicode__
def __unicode__(self):
return self.name
then, you will see
[<Card: Hot Pot>]
