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Questions and Answers
What will be the output of the code x = 5 y = '10' print(x + int(y))?
Which of the following is not a valid variable name in Python?
What will be the output of print(my_list) where my_list = [1, 2, 3, 4]?
Which of the following is not a valid data type in Python?
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What will be the output of print(x ** y) where x = 5 and y = 2?
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Which of the following data types is mutable in Python?
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Study Notes
Python Code Snippets and Concepts
Code Snippet 1: Int and Str Addition
- The output of the code snippet
x = 5; y = "10"; print(x + int(y))is 15. - The code converts the string "10" to an integer using
int(y)and then adds it to the integerx.
Valid Variable Names
-
my_variableis a valid variable name in Python. -
_myVariableis a valid variable name in Python. -
1variableis not a valid variable name in Python. -
myVariable2is a valid variable name in Python.
Code Snippet 2: Printing a List
- The output of the code snippet
my_list = [1, 2, 3, 4]; print(my_list)is the entire list[1, 2, 3, 4].
Valid Data Types
-
listis a valid data type in Python. -
dictionaryis a valid data type in Python. -
tupleis a valid data type in Python. -
structis not a valid data type in Python.
Code Snippet 3: Exponentiation
- The output of the code snippet
x = 5; y = 2; print(x ** y)is 25. - The code uses the exponentiation operator
**to calculate the result ofxto the power ofy.
Mutable Data Types
-
listis a mutable data type in Python. -
stringis not a mutable data type in Python. -
setis a mutable data type in Python. -
tupleis not a mutable data type in Python.
Code Snippet 4: Dictionary get() Method
- The output of the code snippet
my_dict = {"a": 1, "b": 2, "c": 3}; print(my_dict.get("d", 0))is 0. - The code uses the
get()method to retrieve the value of key "d" from the dictionary, and returns 0 if the key is not found.
Adding Elements to a List
- The
append()method can be used to add an element to the end of a list in Python. - The
insert()method can be used to add an element at a specific position in a list in Python. - The
extend()method can be used to add multiple elements to the end of a list in Python. - The
pop()method is used to remove an element from a list in Python.
Code Snippet 5: String Slicing
- The output of the code snippet
my_string = "hello"; print(my_string[::-1])is "olleh". - The code uses string slicing to reverse the string "hello".
Python Variables
- Python variables do not need to be declared before they can be used.
- Python is a dynamically typed language, which means variable types can be changed.
- Python variables are case-sensitive.
- Python variables can store various types of values, including numerical, string, and boolean values.
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Description
Test your knowledge of Python variables, data types, and lists with this quiz. Questions cover topics such as variable types, valid variable names, output of code snippets, and data types in Python.
