Jimmy Fikes

@r0ktech 38. a is a string ('3') and is then repeated twice. So after line 2, a is '33'. In the print statement a is cast as an int and then 33 is added to 5 -> so 38.

what is the output ?

@clcoding Error. Dictionary keys must be immutable. This snippet is trying to create a dictionary key with a list, which is mutable.

What will be the output of the following Python code? d = {} key = [1, 2] d[key] = "value" print(d)

@PythonPr A. -1 refers to the last element in the list. Counting backwards to -3 points to the 2. Start with the 2 and step forward by one but stop before you get to -1 gives us [2,3].

Python Question / Quiz; What is the output of the following Python code, and why? Comment your answers below!

@PythonPr A. The original list, [1,2] is replicated twice and results in [1,2,1,2].

Python Question / Quiz; What is the output of the following Python code, and why? Comment your answers below!

@Python_Dv The last line (as shown in this snippet) is not indented properly and should raise an indentation error. If the author meant for the last line to be on the left margin, the output would be A\nC.

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@Python_Dv B. b creates a shallow copy of a and the first item in b is changed to 100. If we print(b), we get [100,2,3] but the example asks for print(a) which is still [1,2,3]

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@PythonPr 3. List range(5) uses the values 0,1,2,3,4 to create a list that results in [0,1,4,9,16] (each item being squared). Next, the List variable is reassigned to the pop() method of the original list and 16 is returned and added to 16. So, 16+16 is 32.

Python Question / Quiz; What is the output of the following Python code, and why? Comment your answers below!

@clcoding Answer is 2. The reduce function acts on each item in an iterable. A function is applied that works through each item (in a list in this example) and returns a single result. 2-1 is 1, and 3-1 is 2.

What will be the output of the following Python code? from functools import reduce data = [1, 2, 3] result = reduce(lambda x, y: y - x, data) print(result)

@Python_Dv B. Replication before concatenation (works the same as multiplication before addition). So (3 * '2') is 222. Then, concatenate 1 to 222 to get 2221.

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@Python_Dv D. Sets can handle only immutable values and a list is mutable.

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@PythonPr A. A string replicated twice is no different than the same string concatenated twice. This is True.

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@Python_Dv B.

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@Python_Dv 1. The result is 8. x and y are integers and they are easily added.

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@PythonPr 544. Multiplication before addition. 4 is repeated and 5 is concatenated onto the beginning of 44.

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@Python_Dv C. 10 == 10.0 is True.

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@PythonPr B. Multiplication before addition.

Python Question / Quiz; What is the output of the following Python code, and why? Comment your answers below!

@PythonPr 'Oops' will print. The first if statement is True since 3 is greater than 2. Then, the 2nd if statement can run (since the 1st one is True). However, the 2nd statement is False since 3 is not greater than 5. So, the else statement executes and prints 'Oops'

Python Question / Quiz; What is the output of the following Python code, and why? Comment your answers below!

@PythonPr C. The keys method should be d.keys().

Python Question / Quiz; What is the output of the following Python code, and why? Comment your answers below!

@PythonPr This returns None because the sort() method changes the list x in place - it does not create a new list object as we would have it we used sorted() instead of sort(). If we change the list first, and then print(x), we will see the original list sorted by length of each element.

Python Question / Quiz; What is the output of the following Python code, and why? Comment your answers below!

@Python_Dv C. Syntax error since the assignment operator (=) is used instead of the equality operator (==).

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