Python programming for Beginners - II

Python programming for Beginners - II

• 1.
  Python Programming -II Data Types, Numbers, Strings, Tuples
• 2.
  Data Types • Numbers •String • List • Tuple • Dictionary
• 3.
  Numbers Type Description int Signedinteger long Long Integers ( deprecated not available from Python 3.x ) float Floating point real values complex Contains integer in the range of 0 - 255
• 4.
  Number Samples >>> a= 382 >>> print (int(a)) 382 >>> print (float(a)) 382.0 >>> print (complex(a)) (382+0j) >>> print (complex(a, 10)) (382+10j)
• 5.
  Number Samples … >>>b = 34 >>> print (int(b)) 34 >>> c = 45.5 >>> print (float(c)) 45.5 >>> d = int(b) + int(c) >>> print (d) 79 >>> e = float(b) + float(c) >>> print (e) 79.5 >>> print (complex(b)) (34+0j) >>> i = 30 >>> print (complex(b, i)) (34+30j) >>> h = complex(b,i) + complex(i,b) >>> print (h) (64+64j) >>> k = complex(b,i) * complex(i,b) >>> print (k) 2056j >>> k = complex(b,i) + complex(b,i) >>> print (k) (68+60j) >>> k = complex(b,i) * complex(b,i) >>> print (k) (256+2040j) >>> l = float(b) * float(c) >>> print (l) 1547.0 >>> m = int(b) * int(c) >>> print (m) 1530 >>>
• 6.
  String • Character sequenceenclosed with in quote • Denoted by • single quotes ‘ • double quotes “ • Triple Quotes “”” • Sample >>> firstName = 'Hariharan' >>> lastName = "Veerappan“ >>> print (firstName) Hariharan >>> print (lastName) Veerappan >>> address = """No 16 Ganesh 1st cross street""" >>> print (address)
• 7.
  List • Contains aseries of values • Can be declared by using brackets [] • Sample A = [] B = [1, 4, 56, 78, 45] C = [“hari”, “haran”, “neevee”] • Not limited with a single dimension D = [[], []] E = [ [1,2,3], [4,5,6]] • List size determined by “len()”
• 8.
  List Methods • list.append(elem) •list.insert(index, elem) • list.extend(list2) • list.index(elem) • list.remove(elem) • list.sort() • list.reverse() • list.pop(index)
• 9.
  Tuples • Sequence ofimmutable python objects • Are sequences, just similar to lists • Tuples cannot be changed unlike lists • Uses parathesis, whereas lists uses square brackets • cmp(tup1,tup2) • len(tup) • max(tup) • min(tup) • tuple(seq)
• 10.
  Tuple Operations Python ExpressionResults Description len((1,2,3)) 3 Length (1,2,3) + (4,5,6) (1,2,3,4,5,6) Concatenation (‘Hi’) * 2 (‘Hi’, ‘Hi’) Repetition 3 in (1,2,3) True Membership
• 11.
  Tuple Sample tup1 =('physics', 'chemistry', 1997, 2000); tup2 = (1, 2, 3, 4, 5, 6, 7 ); print (tup1[0]: ); print (tup2[1:5]); tup3 = tup1 + tup2 print(tup3)
• 12.
  Dictionary • Are listsof key:value • Powerful datatype holds lot of related information through keys • Extract the value based on keys • Created by using braces {} and separated by commas • Key associated value with :
• 13.
  Dictionary Sample student ={‘hari’ : 423, ‘haran’:445} print (student[‘hari’]) print (student[423]) student[‘hari’] = 441 student[‘neevee’] = 233 print(student.keys()) avail = ‘haran’ in student print (avail)
• 14.
  Arithmetic Operators Operators Description +Adds the two operands - Subtract the second operand from the first * Multiplies the operands / Divides the first operand by second operand % Divides first operand by second operand & returns remainder
• 15.
  Relational Operators Operators Description ==Returns true, if operands are equal. Else returns false != Returns true, if both operands are not equal, else false > Returns true, if first operand is greater, else false < Returns true, if first operand is lesser, else false >= Returns true, if first operand is greater or equal, else false <= Returns true, if first operand is lesser or equal, else false
• 16.
  Bit Wise Operators OperatorsDescription & AND both operands bit by bit | OR both operands bit by bit ~ 1’s complement bit by bit ^ EX-OR both operands bit by bit >> Rotate right by number of bits << Rotate left by number of bits
• 17.
  Assignment Operators Operators Description =Assigns left operand with the right operand value += Adds the both operand and assign to left operand -= Subtracts the right from left operand and assign to left *= Multiplies both operands & assign to left /= Divides the left operand by right & assign to left %= Modulus of left operand by right operand & assign to left >>= Rotate right the left operand & assign to left <<= Rotate left by right operand & assign to left
• 18.
  Web : www.neeveetech.com E-Mail: nvhariharan@neeveetech.com Thank You.