week2

#!/usr/bin/env python

from __future__ import division
a=7/3
b=round(a, 4)
c=9
d=10
c+=1
d-=1
print (a)
print(b)
print(c)
print(d)

new_file=open("file.txt")
# default mode is a read
open_new_file=new_file.read()
print (open_new_file)
#real world application
new_file.close()


#reading file line by line
f_readline=open("file.txt")
open_f_readline=f_readline.readline()
print(open_f_readline)

#reading all the lines in one goal: it will return a list that have all the lines of the file
f_readlines=open("file.txt")
open_f_readlines=f_readlines.readlines()
print(open_f_readlines)



#contest management way, python automatically close the file handle.
with open("file.txt") as f:
	output=f.readline()
print (output)




#write operations

v=open('new_file1.txt', mode='w')
v.write('something special\n')
v.flush()

#write  operation
with open('new_file.txt', mode='w') as m:
	m_output=m.write('something special\n')

#ppend operation
z=open('new_file1.txt', mode='a')
z.write('something special\n')
z.flush()


########################################
############LISTS######################
#######################################

my_list=[]

my_list.append('tosin')
print (my_list)
my_list.append('dayo')
print( (my_list) + [1,2,3])

my_new_list=[1,2,3,'tosin','dayo']

x=my_new_list.extend([10,'dayo'])
print(x)
#remove the last element
y=x.pop()
#removes the last on the list
print(y)

#remove from the first index
my_new_list.pop(0)
#OR
del my_new_list[2]


#counts number of times 'tosin' is in the list
my_list.count('tosin')


#index where hello first appeared
my_list.index('tosin')



# https://www.tutorialspoint.com/python/python_lists.htm


my_list=[1,2,3,'amazon','google']
new_list=['UN','hertz']
my_list.append(new_list)


for i in range(0,len(my_list)):
    print i

for i in range(0,len(my_list)):
    print (str(i) +' is equal to : ' + str(my_list[i]))



##########TUPLE############
txt = 'but soft what light in yonder window breaks'
words = txt.split()
t = list()
for word in words:
   t.append((len(word), word))

t.sort(reverse=True)

res = list()
for length, word in t:
    res.append(word)

print res

d = {'a':10, 'b':1, 'c':22}
l = list()
for key, val in d.items() :
     l.append( (val, key) )
datacenter1 = {'spines': ['r1', 'r2', 'r3', 'r4']}
datacenter1['leafs']=['l1', 'l2', 'l3', 'l4']

for i,j in datacenter1.items():
	print(i,j)
l

m = [ 'have', 'fun' ]
x, y = m
x
y


d = {'a':10, 'b':1, 'c':22}
t=d.items()
print t



ipv6='2001:0db8:85a3:0000:0000:8a2e:0370:7334'
x=ipv6.split(':')
y=(':').join(x)


******SYS>ARGV*****

#!/usr/bin/enc python
from __future__ import print_function
import sys

print(sys.argv)