Useful functions:
1.len():
Return the length (the number of items) of an object. The argument may be a sequence (such as a string, bytes, tuple, list, or range) or a collection (such as a dictionary, set, or frozen set).
Example:
Return the number of
characters in a string:
mylist = "Hello"
x = len(mylist)
Output:
5
Example2:
Return the number of items in a list:
mylist
= ["apple", "banana", "cherry"]
x = len(mylist)
Output:
3
2.Range():
The built-in function range() generates the integer numbers between the given start integer to the stop integer, i.e., It returns a range object. Using for loop, we can iterate over a sequence of numbers produced by the range() function. Let’s understand how to use a range() function of Python 3 with the help of a simple example.
Example:
for i in range(6):
print(i, end=', ')
Output:
0, 1, 2, 3, 4, 5,
Syntax for range function is :-
range(start, stop[, step])
It takes three arguments. Out of the three 2 arguments are optional. I.e., start and step are the optional arguments.
A start argument is a starting number of the sequence. i.e., lower limit. By default, it starts with 0 if not specified.
A stop argument is an upper limit. i.e., generate numbers up to this number, The range() doesn’t include this number in the result.
The step is a difference between each number in the result. The default value of the step is 1 if not specified.
Example2:
for i in range(2, 10, 2):
print(i, end=', ')
Output:
2, 4, 6, 8,
Much more information on range function can be found here:
https://pynative.com/python-range-function/
3.Map function():
Python supports functional programming through a number of
inbuilt features. One of the most useful is the map() function
— especially in combination with lambda functions.
x = [1, 2, 3]
y = map(lambda x : x + 1 , x)
# prints out [2,3,4]print(list(y)) In the example above, map() applies a simple lambda function to each
element in x.
It returns a map object, which can be converted to some iterable object such as
a list or tuple.
Syntax:
map(function, iterables)
4.Split function():
split() method returns a list of strings after breaking the given string by the specified separator.
Syntax :
str.split(separator, maxsplit)
Example:
Split a string into a list where each word is a list item:
txt = "welcome to
the jungle"
x = txt.split()
print(x)
Output:
['welcome', 'to', 'the', 'jungle'], 'ju
5.Sorted function():
The sorted()
function returns a sorted list of the specified iterable object.
You can specify
ascending or descending order. Strings are sorted alphabetically, and numbers
are sorted numerically.
Example:
Sort a tuple:
a =
("b", "g", "a", "d", "f",
"c", "h", "e")
x = sorted(a)
print(x)
Output:
['a', 'b', 'c',
'd', 'e', 'f', 'g', 'h']
More detailed
information is available below in this page:
https://www.programiz.com/python-programming/methods/built-in/sorted
You can find many more useful functions below with examples:
https://www.w3schools.com/python/python_ref_functions.asp
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