Python second ppt

Python second ppt

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  Content Variables  Keywords  Identifiers Operators  Comments
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  A variable inPython represents an entity whose value can change as and when required. Conceptually, it is a memory location which holds the actual value. For Ex-X=5 (Where the type of x is int ) Variable Value
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  Python has aset of keywords that are reserved words that cannot be used as variable names, function names, or any other identifiers.
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  if elif True NoneFalse Break AND Continue Assert Await finally
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  Identifiers Python identifiers areuser-defined names to represent a variable, function, class, module or any other object. Where “first” is an identifier Where “sum” is an identifier Ex -1 Class first Ex-2 def sum()
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  Rules for writing identifiers 2 Itcan be combination of uppercase and lowercase letters, digits or an underscore(_). 1 An identifier can not start with digit. So while variable1 is valid, 1variable is not valid. 3 We can’t use special symbols like !, #, @, %, $ etc in our identifier. 4 It can be of any length.
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  Arithmetic Operators Comparison Operators AssignmentOperators Logical Operators Bitwise Operators Membership Operators Identity Operators Types of Operator
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  Arithmetic Operators Operator NameExample + Addition x + y - Subtraction x - y * Multiplication x * y / Division x / y % Modulus x % y ** Exponentiation x ** y // Floor division x // y
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  Assignment Operators Operator ExampleSame As = x = 5 x = 5 += x += 3 x = x + 3 -= x -= 3 x = x - 3 *= x *= 3 x = x * 3 /= x /= 3 x = x / 3 %= x %= 3 x = x % 3 //= x //= 3 x = x // 3 **= x **= 3 x = x ** 3 &= x &= 3 x = x & 3
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  Comparison Operators Operator NameExample == Equal x == y != Not equal x != y > Greater than x > y < Less than x < y >= Greater than or equal to x >= y <= Less than or equal to x <= y
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  Logical Operators Operator DescriptionExample and Returns True if both statements are true x < 5 and x < 10 or Returns True if one of the statements is true x < 5 or x < 4 not Reverse the result, returns False if the result is true not(x < 5 and x < 10)
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  Identity Operators Operator DescriptionExample is Returns True if both variables are the same object x is y is not Returns True if both variables are not the same object x is not y
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  Bitwise Operators Operator NameDescription & AND Sets each bit to 1 if both bits are 1 | OR Sets each bit to 1 if one of two bits is 1 ^ XOR Sets each bit to 1 if only one of two bits is 1 << Zero fill left shift Shift left by pushing zeros in from the right and let the leftmost bits fall off >> Signed right shift Shift right by pushing copies of the leftmost bit in from the left, and let the rightmost bits fall off
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  Membership Operators Operator DescriptionExample in Returns True if a sequence with the specified value is present in the object x in y not in Returns True if a sequence with the specified value is not present in the object x not in y
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  Comment Comments are linesthat exist in computer programs that are ignored by compilers and interpreters. Depending on the purpose of your program, comments can serve as notes to yourself or reminders, or they can be written with the intention of other programmers being able to understand what your code is doing. Ex- # This is comment Comment Syntax
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