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
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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
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Pyhton - Logging
Pyhton - pint module
End of life Python 2
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Pyhton - Examples
Python installation
Python Iterate Array
Iterate array elements using enumerate method
This is predefined function in python which adds counter or index to the array.It allows to loop over array with index.
#!/usr/bin/python
list_arr = [10, 20, 30, 40, 50]
for index, val in enumerate(list_arr):
print("index: %d -> val: %d" % (index, val))
Output:
$ python for_enumerate.py index: 0 -> val: 10 index: 1 -> val: 20 index: 2 -> val: 30 index: 3 -> val: 40 index: 4 -> val: 50Even there is an optional parameter in enumerate method to specify the starting index.
#!/usr/bin/python
list_arr = [10, 20, 30, 40, 50]
# start index is 1 here
for index, val in enumerate(list_arr, 1):
print("index: %d -> val: %d" % (index, val))
Output:
index: 1 -> val: 10 index: 2 -> val: 20 index: 3 -> val: 30 index: 4 -> val: 40 index: 5 -> val: 50
Iterate array elements using range and len method
#!/usr/bin/python
list_arr = [10, 20, 30, 40, 50]
for index in range(len(list_arr)):
print("index: %d -> val: %d" % (index, list_arr[index]))
Output:
$ python for_range.py index: 0 -> val: 10 index: 1 -> val: 20 index: 2 -> val: 30 index: 3 -> val: 40 index: 4 -> val: 50
Iterate array elements using xrange and len method
#!/usr/bin/python
list_arr = [10, 20, 30, 40, 50]
for index in xrange(len(list_arr)):
print("index: %d -> val: %d" % (index, list_arr[index]))
Output:
$ python test_xrange.py index: 0 -> val: 10 index: 1 -> val: 20 index: 2 -> val: 30 index: 3 -> val: 40 index: 4 -> val: 50
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