Python Tutorial
Pyhton - Introduction
Pyhton - First Program
Pyhton - Comments
Pyhton - Lines / Indent
Pyhton - Multiple lines
Pyhton - Data Types
Pyhton - Variables
Pyhton - Type Conversion
Pyhton - Control Flows
Pyhton - Loops
Pyhton - Command Line Args
Pyhton - Basic Operators
Pyhton - Functions
Pyhton - String Methods
Pyhton - Files IO
Pyhton - REST API
Pyhton - Connect DB
Pyhton - Multithreading
Pyhton - Lists
Pyhton - Iterate Array
Pyhton - Exceptions
Pyhton - Lambdas
Pyhton - Modules
Pyhton - Invoke C
Pyhton - List Comprehensions
Pyhton - Generators
Pyhton - Class
Pyhton - Inheritance
Pyhton - Static & Class Methods
Pyhton - Decorators
Pyhton - pass
Pyhton - json
Pyhton - yaml
Pyhton - Socket
Pyhton - Logging
Pyhton - pint module
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Pyhton - Examples
Python installation
Python Type Conversion
What is type conversion in python?
Type conversion is common to assign a value of one type to a variable of another type.var = "100" # int method converts string value into integer value. val = int(var) # prints integer value 100 here. print val
Some predefined type conversion methods in python
| Methods | Description |
|---|---|
| int(var) | Converts var to an integer |
| long(var) | Converts var to a long integer |
| float(var) | Converts var to a float number |
| complex(real [,imag]) | Converts into complex number. |
| str(var) | Converts var to a string |
| eval(str) | Evaluates and returns an object |
| repr(obj) | Converts object into an expression string. |
| frozenset(obj) | Converts object into a frozen set. | tuple(value) | Converts value to a tuple |
| list(obj) | Converts obj to a list. |
| set(obj) | Converts obj to a set. |
| dict({key1: value1}, {key2:value2}..) | Creates a dictionary with initialized items |
| chr(int_var) | Converts int to a character |
| unichr(int_var) | Converts int to a Unicode character |
| hex(int_var) | Converts int to a hexadecimal string. |
| oct(int_var) | Converts int to an octal string. |
Python Type Conversion Example
#!/usr/bin/python
var_a = 45;
print "string " + str(var_a);
var_b = "(34 + 45)";
var_eval_result = eval(var_b);
print("Evaluate String: %d" % var_eval_result);
var_c = float(var_a)/float(2);
print("divison in float: %f" % var_c);
Output:
$ python typte_conversion.py string 45 Evaluate String: 79 divison in float: 22.500000
repr type conversion example
#!/usr/bin/python
var_b = repr(34 + 45);
var_eval_result = eval(var_b);
print("Evaluate String: %d" % var_eval_result);
Output:
$ python typte_conversion.py Evaluate String: 79
Frozen set
Frozen set is just an immutable version of a Python set object. Elements of a frozen set cannot be modified at any time, remains the same after creation but elements in set can be modified.Returns an empty frozenset if no parameters in frozenset method.
#!/usr/bin/python
var_b = {1, 2, 3, 6, 7};
var_result = frozenset(var_b);
print("frozenset is: %s" % var_result);
print("frozenset empty is: %s" % frozenset());
Output:
$ python typte_conversion.py frozenset is: frozenset([1, 2, 3, 6, 7]) frozenset empty is: frozenset([])
Type Casting float/int in python
int type casting
Type casting string format int and float value to int, resulting invalid result when type casting into int value.
#!/usr/bin/python
def validSalary(sal):
try:
sal = int(sal);
return 4000 <= sal <= 7000;
except ValueError as ex:
return False;
print "Salary 5000 is ", validSalary('5000');
print "Salary 5000.0 is ", validSalary('5000.0');
print "Salary '' is ", validSalary('');
Output:
$ python type_conversion.py Salary '5000' is True Salary '5000.0' is False Salary '' is False
float type casting
#!/usr/bin/python
def validSalary(sal):
try:
sal = float(sal);
return 4000 <= sal <= 7000;
except ValueError as ex:
return False;
print "Salary '5000' is ", validSalary('5000');
print "Salary '5000.0' is ", validSalary('5000.0');
print "Salary '' is ", validSalary('');
Output:
$ python type_conversion.py Salary '5000' is True Salary '5000.0' is True Salary '' is False
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