Python 面试题与答案

问题 16. What is a boolean in Python?

Boolean is one of the built-in data types in Python, it mainly contains two values, which are true and false. 

Python bool() is the method used to convert a value to a boolean value.

问题 17. What are the functions in Python?

In Python, functions are defined as a block of code that is executable only when it is called. The def keyword is used to define a function in Python.

问题 18. Define self in Python?

In Python self is defined as an object or an instance of a class. This self is explicitly considered as the first parameter in Python. Moreover, we can also access all the methods and attributes of the classes in Python programming using self keyword.  

In the case of the init method, self refers to the newer creation of the object. Whereas in the case of other methods self refers to the object whose method was called. 

问题 19. How do we convert the string to lowercase?

 The lower() function is used to convert string to lowercase.

Example:

str = "WithoutBook"

print(str.lower())

Output:

withoutbook

问题 20. What is Try Block in python?

A block that is preceded by the try keyword is known as a try block.

Syntax:

try {

    // Statements that may cause exception

}