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Questions and Answers
What does the datetime.timedelta object represent in Python's datetime module?
What does the datetime.timedelta object represent in Python's datetime module?
Which module must be imported to use the sleep() function in Python?
Which module must be imported to use the sleep() function in Python?
Which of the following is NOT a class provided by the datetime module?
Which of the following is NOT a class provided by the datetime module?
What will be the output of the code print(datetime.datetime.now())?
What will be the output of the code print(datetime.datetime.now())?
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What is the primary purpose of the functions found in the math module?
What is the primary purpose of the functions found in the math module?
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When using time.sleep(t), what does the argument 't' represent?
When using time.sleep(t), what does the argument 't' represent?
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Which of the following statements about the datetime module is accurate?
Which of the following statements about the datetime module is accurate?
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How does the Python time sleep function affect program execution?
How does the Python time sleep function affect program execution?
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What does the math.ceil() function do?
What does the math.ceil() function do?
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How can the value of pi be accessed using the math module?
How can the value of pi be accessed using the math module?
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Which of the following functions is used to compute the hyperbolic cosine of a number?
Which of the following functions is used to compute the hyperbolic cosine of a number?
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What does the math.comb(n, k) function return?
What does the math.comb(n, k) function return?
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What will be the output of the following code: from math import *; print(sqrt(16))?
What will be the output of the following code: from math import *; print(sqrt(16))?
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What is the effect of importing a module using 'import math as m'?
What is the effect of importing a module using 'import math as m'?
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What is true about pseudo-random numbers?
What is true about pseudo-random numbers?
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If you wanted to convert radians to degrees using the math module, which function would you use?
If you wanted to convert radians to degrees using the math module, which function would you use?
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What type of error is raised when you try to add a string to an integer in Python?
What type of error is raised when you try to add a string to an integer in Python?
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Which exception is raised when a piece of code has a typo or syntax issue?
Which exception is raised when a piece of code has a typo or syntax issue?
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What happens if you try to access an index that is out of range in a list?
What happens if you try to access an index that is out of range in a list?
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If you try to divide a number by zero, which exception will be raised?
If you try to divide a number by zero, which exception will be raised?
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When might a KeyError occur in a Python program?
When might a KeyError occur in a Python program?
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What will be the output of the following code snippet? x = 5; y = 'hello'; try: z = x + y; except TypeError: print('Error: cannot add an int and a str')
What will be the output of the following code snippet? x = 5; y = 'hello'; try: z = x + y; except TypeError: print('Error: cannot add an int and a str')
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What type of error occurs if an attribute is not found on an object?
What type of error occurs if an attribute is not found on an object?
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Which of the following exceptions is raised when trying to convert a string that doesn't represent a number into an integer?
Which of the following exceptions is raised when trying to convert a string that doesn't represent a number into an integer?
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In the provided try-except examples, which type of error is not caught explicitly in the first block of code shown?
In the provided try-except examples, which type of error is not caught explicitly in the first block of code shown?
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What is the main purpose of using a try-except statement in programming?
What is the main purpose of using a try-except statement in programming?
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What type of Python error is raised when an import statement fails?
What type of Python error is raised when an import statement fails?
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Which statement about the catch specific exception mechanism is true?
Which statement about the catch specific exception mechanism is true?
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If you modify the first code snippet to except ValueError: print('ValueError occurred'), what would happen?
If you modify the first code snippet to except ValueError: print('ValueError occurred'), what would happen?
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What is the main purpose of using try-except blocks in coding?
What is the main purpose of using try-except blocks in coding?
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Which of the following statements is true about syntax errors?
Which of the following statements is true about syntax errors?
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What kind of error is raised when dividing a number by zero?
What kind of error is raised when dividing a number by zero?
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Which exception is raised when attempting to add an integer and a string together?
Which exception is raised when attempting to add an integer and a string together?
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What is a key characteristic of exceptions compared to syntax errors?
What is a key characteristic of exceptions compared to syntax errors?
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In the case of a TypeError, what is a valid way to resolve the error using a try-except block?
In the case of a TypeError, what is a valid way to resolve the error using a try-except block?
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What type of error message is generated by an unhandled ZeroDivisionError?
What type of error message is generated by an unhandled ZeroDivisionError?
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What is the correct syntax to handle exceptions in Python?
What is the correct syntax to handle exceptions in Python?
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What will be the output when fun(3) is called?
What will be the output when fun(3) is called?
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What happens if you comment out the line fun(3) in the provided code?
What happens if you comment out the line fun(3) in the provided code?
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Which statement best describes the purpose of finally in a try-except block?
Which statement best describes the purpose of finally in a try-except block?
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What would be printed when calling AbyB(5,0)?
What would be printed when calling AbyB(5,0)?
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What does the else clause in a try-except block do?
What does the else clause in a try-except block do?
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In the example using the finally keyword, what will always be printed?
In the example using the finally keyword, what will always be printed?
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What is the result of the expression 5 // 0 in the try block?
What is the result of the expression 5 // 0 in the try block?
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What does the raise statement do in Python?
What does the raise statement do in Python?
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Study Notes
Built-in Python Modules
- Python Standard Library is a collection of modules for scripts, reducing rewriting common commands.
- Modules are imported at the start for reuse.
-
datetimemodule provides objects for storing date and time information. -
datetime.date: Generates dates without times. -
datetime.time: Stores times not linked to specific dates. -
datetime.datetime: Stores dates and times. -
datetime.timedelta: Calculates date or time differences. -
datetime.timezone: Represents time zone offsets from UTC
Import Time
- Python
time.sleep()adds delays to program execution in seconds. -
time.sleep()pauses the current thread, not the whole program. - Python
timemodule must be imported before usingsleep().
The Math Module
- Contains mathematical functions, primarily applied to floating-point numbers.
- Suitable for complex number operations.
-
math.acos(): Calculates the arc cosine of a number. -
math.acosh(): Returns the inverse hyperbolic cosine. -
math.ceil(): Rounds a number up to the nearest integer. -
math.comb(): Calculates the number of combinations. -
math.copysign(): Copies the sign of one number to another. -
math.cosh(): Calculates the hyperbolic cosine. -
math.degrees(): Converts an angle from radians to degrees.
Importing a Module and Assigning an Alias
- Allows importing a module with a different name (alias).
- Using an alias makes code more readable, keeping it concise.
The Random Module
- Generates pseudo-random numbers.
- Useful for applications needing randomness (games, simulations).
-
random.randint(): Generates a random integer between given limits.
Python Exception Handling
- Errors in Python are of two types:
- Syntax errors: Occur due to incorrect code structure.
- Exceptions: Occur during execution from internal events.
-
try...exceptstatements handle potential errors.
Different Types of Exceptions
-
SyntaxError: Occurs when the interpreter encounters incorrect syntax (e.g., missing colon). -
TypeError: Occurs when an operation is applied to an object of the wrong type. -
NameError: Occurs when a variable or function name is not found. -
IndexError: Occurs when accessing an index outside a sequence's bounds. -
KeyError: Occurs when trying to access a key that doesn't exist in a dictionary. -
ValueError: Occurs when a function or method receives inappropriate arguments. -
AttributeError: Occurs when trying to access a non-existent attribute. -
IOError: Occurs when I/O operations (file handling) fail. -
ZeroDivisionError: Occurs when dividing by zero. -
ImportError: Occurs when importing a module fails.
Difference Between Syntax Errors and Exceptions
- Syntax errors prevent program execution immediately.
- Exceptions occur during execution but don't typically halt the program if handled.
Try...Except Statements: Handling Exceptions
-
tryblock: Contains code potentially causing errors. -
exceptblock: Contains error-handling code. - Provides a way to catch and handle exception.
Catching Specific Exceptions
-
except ExceptionTypeallows catching specific errors (e.g.,ZeroDivisionError).
Try...Else Clause
-
elseblock: Executed if thetryblock completes without exceptions.
Finally Clause
-
finallyblock: Always executes, regardless of exceptions, ideal for cleanup.
Raising Exceptions
-
raise ExceptionType(message)forces an exception; important for program control.
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Description
Explore the functionalities of built-in Python modules such as datetime, time, and math. This quiz covers importing modules, using time delays, and performing mathematical calculations. Test your knowledge on how these modules can enhance your Python programming skills.
