Python Built-in Functions

• Python provides a lot of built-in functions that ease the writing of code.

• Built-in functions are predefined functions that are already available in Python.

• eval()

• Python eval() function parse the expression argument and evaluate it as a python expression and runs python expression (code) within the program.

• Let's say the math part is in string format, the eval() function helps to evaluate the mathematical calculation in the parse.

• Syntax: eval(expression, globals=None, locals=None)

x="5*6"
y=eval(x)
print(y)

This will return 30.

• len()

• Python len() function is an inbuilt function in Python. It can be used to find the length of an object.

• Syntax: len(Object)

numbers=[10,52,8,34]
new_var = numbers
x=len(new_var)
print(x)

This will return 4.

• sorted()

• Python sorted() function returns a sorted list from the iterable object.

• Syntax: sorted(iterable, key, reverse)

numbers=[10,52,8,34]
new_var = numbers
x=sorted(new_var)
print(x)

This will return [8, 10, 34, 52].

• reversed()

• Python reversed() method returns an iterator that accesses the given sequence in the reverse order.

• Syntax: reversed(seq) #seq: sequence to be reversed.

a=['Python','Programming','Language']
x=reversed(a)

for i in x:
    print(i)

Which will return:

Language
Programming
Python

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