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Python Variables


Variable is a name of the memory location where data is stored. Once a variable is stored that means a space is allocated in memory.

Assigning values to Variable:

We need not to declare explicitly variable in Python. When we assign any value to the variable that variable is declared automatically.

The assignment is done using the equal (=) operator.

Eg:

assigningvaluestovariable

Output:

  1. >>>
  2. 10
  3. ravi
  4. 20000.67
  5. >>>

Multiple Assignment:

Multiple assignment can be done in Python at a time.

There are two ways to assign values in Python:

1. Assigning single value to multiple variables:

Eg:

  1. x=y=z=50
  2. print x
  3. print y
  4. print z

Output:

  1. >>>
  2. 50
  3. 50
  4. 50
  5. >>>

2.Assigning multiple values to multiple variables:

Eg:

  1. a,b,c=5,10,15
  2. print a
  3. print b
  4. print c

Output:

  1. >>>
  2. 5
  3. 10
  4. 15
  5. >>>

The values will be assigned in the order in which variables appears.

Basic Fundamentals:

This section contains the basic fundamentals of Python like :

i)Tokens and their types.

ii) Comments

a)Tokens:

  • Tokens can be defined as a punctuator mark, reserved words and each individual word in a statement.
  • Token is the smallest unit inside the given program.

There are following tokens in Python:

  • Keywords.
  • Identifiers.
  • Literals.
  • Operators.

Tuples:

  • Tuple is another form of collection where different type of data can be stored.
  • It is similar to list where data is separated by commas. Only the difference is that list uses square bracket and tuple uses parenthesis.
  • Tuples are enclosed in parenthesis and cannot be changed.

Eg:

  1. >>> tuple=(‘rahul’,100,60.4,‘deepak’)
  2. >>> tuple1=(‘sanjay’,10)
  3. >>> tuple
  4. (‘rahul’10060.4‘deepak’)
  5. >>> tuple[2:]
  6. (60.4‘deepak’)
  7. >>> tuple1[0]
  8. ‘sanjay’
  9. >>> tuple+tuple1
  10. (‘rahul’10060.4‘deepak’‘sanjay’10)
  11. >>>

Dictionary:

  • Dictionary is a collection which works on a key-value pair.
  • It works like an associated array where no two keys can be same.
  • Dictionaries are enclosed by curly braces ({}) and values can be retrieved by square bracket([]).

Eg:

  1. >>> dictionary={‘name’:‘charlie’,‘id’:100,‘dept’:‘it’}
  2. >>> dictionary
  3. {‘dept’‘it’‘name’‘charlie’‘id’100}
  4. >>> dictionary.keys()
  5. [‘dept’‘name’‘id’]
  6. >>> dictionary.values()
  7. [‘it’‘charlie’100]
  8. >>>

 

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