Class 11th Chapter -4 Data Handling
IMPORTANT TERM
1.Atom :- Something that has a value
2.Coercion :-implicit Type Conversion
3.Expression :- Valid combination of operators and atoms
4.Explicit Type Conversion :- Forced data type conversion by the User
5.Immutable Type :- A type whose value is not changeable in place.
6.Implicit Type Conversion :- Automatic Internal Conversion of data type lower to higher type by Python.
7.Mutable Type :- A type whose value a changeable in place
8.Operator :- Symbol/word that triggers on action or operation
9.Type Costing :-Explicit Type Conversion
Answer the following Question.....
1. What are data types ? What are Python's built-in core data types ?
SOLUTION:-
The real life data is of many types. So to represent various types of real-life data, programming languages provide ways and facilities to handle these, which are known as data types, Python's built-in core data types belong to
Numbers (integer, floating-point, complex numbers, Booleans)
String
Tuple
List
Dictionary
2.Which data types of Python handle Numbers?
SOLUTION Python provides following data types to handle numbers
(i) Integers
(ii) Boolean
(iii) Floating-point numbers
(iv) complex numbers
3. Why is Boolean considered a subtype of integers?
SOLUTION Boolean values True and False internally map to integers 1 and 0. That is, internally True is considered equal to 1 and False equal to 0 (zero). When I and 0 are converted to Boolean through bool() function, they return True and False. That is why Booleans are treated as a subtype of integers.
4.What do you understand by term 'immutable?
SOLUTION:-
Immutable means unchangeable. In Python, immutable types are those whose values cannot be changed in place. Whenever one assigns a new value to a variable referring to immutable type, variable's reference is changed and the previous value is left unchanged. e.g.
x=3
x=5
5. What do you mean by Syntax errors and Semantics errors?
SOLUTION :-
Syntax errors are the errors that occur when rules of a programming language violated.
Semantics errors occur when statements are not meaningful.
6.Why are logical errors harder to locate?
SOLUTION :-
In spite of logical errors presence, the program executes without any problems but the output produced is not correct. Therefore, each and every statement of the program needs to b scanned and interpreted. Thus the logical errors are harder to locate.
7. What is an Exception?
SOLUTION :-
Exception in general refers to some contradictory or unusual situation which can be encountered unexpectedly while executing a program.
