added file buildinFunctions.py

Author: thewhitetulip

builtinFunctions.py

@@ -0,0 +1,128 @@
+#!/usr/bin/python
+
+#when we want to find the absolute value of any number
+print abs(-1)
+
+#when we want to find out if a object is iterable or not
+a = [1,2,3,4]
+print all(a) #prints True
+
+#get the binary of number
+print bin(12) #takes an int object
+
+#returns character whose ASCII code is 97
+print chr(97) #takes an int object
+
+#classmethod
+
+Class C:
+   @classmethod
+   def f(arg1, arg2):
+     #some code here
+
+#now we can call f as C.f(1,2)
+
+#to compare two objects
+
+print cmp(2,3)
+#returns -ve if 2<3, +ve if 2>3, zero if 2==3
+
+#creating a complex number
+print complex(1,2) #creates 1+2j, both args are optional
+
+#calculate divisor & quotient in one go
+print divmod(3,2) #returns (1,1)
+
+#evaluating expressions
+x=1
+print eval(`x+1`) # ` is not single quote, evaluates the expression and returns value
+
+#executefile and return result
+execfile('./type.py')
+
+#constructor to a file
+a = file('./demofile','w',3444) # creates a file demofile in write mode with buffer size 3444
+#default open mode is 'r': read, and last two args are optional
+
+#get the hexadecimal value
+print hex(12) #takes a int
+print float.hex(12.12)
+
+#identification of an object
+print id(a)
+
+#converting any base into int
+print int(344, 8) #converts octal 344 to decimal number, you can use '344' as well
+
+#finding if a object is instance of a class or not
+print isinstance(a,file) #prints True if a is file object
+
+#get the length
+print len('python rocks')
+
+#list 
+print list((1,2,3,4))  # returns [1,2,3,4]
+print list('abcde') # returns ['a','b','c','d','e']
+
+#converts any base to long int
+long('2334',8)
+
+#maximum
+print max([1,2,3,4,5]) #prints 5
+
+#minimum
+print min([1,2,3,4,5]) #prints 1
+
+#convert integer to octal
+print oct(23)
+
+#opening a file
+a = open(name, mode, buffering)
+
+#returns unicode character
+print ord('a') #prints 67
+
+#power
+print pow(2,3) #8
+print (2,3,4) #2^3%4 computed more efficiently than manual operation
+
+#printing values
+print('hello %s, %d'%(name, 34))
+print('')
+
+#range
+range(12) #returns a tuple [0,1,...12]
+range(23,34) #returns a tuple [23,24,25.....34]
+range(1,12,3) #returns a tuple [1,4,7..]
+
+#taking input from user
+name = raw_input('enter your name')
+print 'Hello %s'%(name)
+
+#reversing a sequence
+
+a =  reversed((2,435,1,345))
+for i in a:
+   print i
+
+#will print a reverse of the given sequence
+
+#sorting
+a = sorted((23,252,1,2352)) #returns a sorted sequence of the given arg
+for i in a:
+  print i
+
+#string constructor
+print str(234) #returns '234'
+
+#sum
+print sum([1,2,3,4])
+
+#construcor of tuple
+a = tuple((1,2,3,4)) #creates a tuple object and links it with object a
+
+#checking the type of object
+type(12) #returns 'int'
+type('a') #returns 'str'
+type(12.2) #returns 'float'
+