Python revision tour -I
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This document provides an overview of computer science concepts in Python including tokens, keywords, identifiers, data types, operators, statements, and control flow. It defines tokens like keywords and identifiers. It lists Python's main data types like integers, floats, strings, lists, tuples, dictionaries, and sets. It describes different types of operators like arithmetic, relational, assignment, logical, and bitwise operators. It also covers statements, blocks of code, and control flow structures like if/else conditionals, loops, break and continue statements.
![Punctuators
Punctuators are symbols (‘ “ () [ ] { } @ , : ‘ =) that are
used in programming language to organize sentence
structure and indicate the rhythm and emphasis of
expressions, statements and program structure](https://image.slidesharecdn.com/pythonrevisiontour-ii-210816033107/85/Python-revision-tour-I-20-320.jpg)
![02
04
01
NUMBERS
a. Integers
a. Integers
b. Boolean
b. Floating Point Numbers
c. Complex Numbers
LIST
A list in Python represents a group of comma-
separated values of any data type between
square brackets []
TUPLE
Tuple is represented as a group of
comma-separated values of any data
type withing parenthesis ().
STRING
All strings in Python 3.0 are sequence of pure
Unicode. Unicode is a System designed to
represent every character from every
language. String can hold any type of known
character
Data Types
DICTIONARY
Dictionary is an unordered set of
comma separated key:value pairs,
within { } . No two keys can be same.
06
SET
A Set is a mutable data type which is created
like lists { }. It can take values of different
types.](https://image.slidesharecdn.com/pythonrevisiontour-ii-210816033107/85/Python-revision-tour-I-26-320.jpg)
Python revision tour -I
- 1. COMPANY NAME Dr. Sunil Kumar PGT JNV Mohindergarh Navodaya Vidyalaya Samiti
- 2. Computer Science with Python XII (As Per CBSE Curriculum)
- 3. Will Learn…….. What is Tokens ? What is Keyword ? What is Identifiers ? What is Operators ? What is Punctuators ?
- 4. Tokens in Python Keyword Identifiers (Names) Literals Operators Punctuators
- 6. Identifiers (Tokens) •An identifier is a user-defined name to represent a variable, a function, a class, a module, or any other object. •It is a programmable entity in Python- one with a name. •It is a name given to the fundamental building blocks in a program.
- 7. Identifiers (Tokens) • Python identifier can be a combination of lowercase/ uppercase letters, digits, or an underscore. o Lowercase letters (a to z) o Uppercase letters (A to Z) o Digits (0 to 9) o Underscore (_) • An identifier cannot begin with a digit.
- 8. Literals String Literals Single Line String Multi-line String Special literals None Numeric Literals Int(signed integers) Decimal Form Octal Form Hexadecimal Form Long(long integers) float(floating point) 0.17E5 3.E2 Complex (complex) a+bj Boolean Literals Literal Collections List literals, Tuple literals, Dict literals, and Set literals
- 20. Punctuators Punctuators are symbols (‘ “ () [ ] { } @ , : ‘ =) that are used in programming language to organize sentence structure and indicate the rhythm and emphasis of expressions, statements and program structure
- 24. Blocks
- 25. Expressions-Represent a Value Statements-Programming Instructions Comments-Readable information Functions-Named code section Block-Group of Statements P R O M M I N G S T R U C T U R E
- 26. 02 04 01 NUMBERS a. Integers a. Integers b. Boolean b. Floating Point Numbers c. Complex Numbers LIST A list in Python represents a group of comma- separated values of any data type between square brackets [] TUPLE Tuple is represented as a group of comma-separated values of any data type withing parenthesis (). STRING All strings in Python 3.0 are sequence of pure Unicode. Unicode is a System designed to represent every character from every language. String can hold any type of known character Data Types DICTIONARY Dictionary is an unordered set of comma separated key:value pairs, within { } . No two keys can be same. 06 SET A Set is a mutable data type which is created like lists { }. It can take values of different types.
- 27. 02 01 MUTABLE TYPES Mutability means that in the same memory address , new values can be stored as and when you want. The types that do not support this property is known as immutable. IMMUTABLE TYPES The immutable types are those that can never change their value in place. Integers, Floating point numbers, Booleans, Strings, Tuples MUTABLE AND IMMUTABLE TYPES
- 28. Type Casting 02 01 EXPLICIT TYPE CONVERSION An Explicit type conversion is user defined conversion that forces an expression to be of specific type. Explicit type conversion is also known as Type Casting. Implicit Type Conversion Implicit Type conversion means the type of conversion, which is automatically performed by the compiler.
- 29. 01 The simplest statement is the empty statement i.e., a statement which does nothing . (pass statement) Empty Statement 02 Compound statements are made of simple statement. Any executable statement is a simple statement. Simple Statement 03 Compound Statement represents a group of statements executed as a unit. Such type of statement are written in specific pattern Compound Statement Statement Flow Control may be executed sequentially or iteratively. Every programming language provide constructs to support sequence, selection or iteration Statement flow Control
- 30. 01 IF CONDITION 02 If-else statement 03 If-elif 04 Nested if 05 Storing Condition THE IF CONDITIONALS
- 31. Decision Making
- 33. If-else Statement Condition True False Block of Code Block of Code
- 34. Condition 1 True False Block of Code Block of Code Block of Code True Condition 2 Condition 3 False True elif ladder
- 35. elif ladder
- 36. Condition 1 True Block of Code Block of Code Block of Code Condition 2 Condition 3 False True if else ladder True False False