10000 Update as per Phil's comments. · tecladocode/python-refresher@35015a8 · GitHub
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Update as per Phil's comments.
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‎.gitignore

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Original file line numberDiff line numberDiff line change
@@ -1,3 +1,4 @@
1+
Python_refresher_notes
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*.cmproj
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*.pyc
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__pycache__
@@ -6,4 +7,4 @@ tempCodeRunnerFile.py
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.vscode/
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.idea/
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videos
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exports
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exports

‎10_loops/code.py

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@@ -13,6 +13,24 @@
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play = input("Would you like to play? (Y/n) ")
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# -- The break keyword --
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while True:
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play = input("Would you like to play? (Y/n) ")
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if play == "n":
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break # Exit the loop
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user_number = int(input("Guess our number: "))
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if user_number == number:
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print("You guessed correctly!")
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elif abs(number - user_number) == 1:
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print("You were off by 1.")
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else:
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print("Sorry, it's wrong!")
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# -- For loop --
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friends = ["Rolf", "Jen", "Bob", "Anne"]

‎12_dictionaries/code.py

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@@ -32,3 +32,8 @@
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print(f"Bob: {student_attendance[student]}")
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else:
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print("Bob isn't a student in this class!")
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# -- Calculate an average with `.values()` --
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attendace_values = student_attendance.values()
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print(sum(attendace_values) / len(attendace_values))

‎13_functions/code.py

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Original file line numberDiff line numberDiff line change
@@ -26,7 +26,7 @@ def print():
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print("Hello, world!") # Error!
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# -- Don't reuse names at any stage, it's generally confusing! --
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# -- Don't reuse names, it's generally confusing! --
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friends = ["Rolf", "Bob"]
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‎14_function_arguments_parameters/code.py

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@@ -46,3 +46,5 @@ def divide(dividend, divisor):
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divide(15, 0)
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divide(15, divisor=0) # That's OK
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# divide(dividend=15, 0) # Not OK, named arguments must go after positional arguments
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# I recommend you use keyword arguments whenever possible, just because it makes things much more readable and maintainable long-term.

‎17_lambda_functions/code.py

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@@ -26,6 +26,9 @@ def double(x):
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sequence = [1, 3, 5, 9]
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doubled = [
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double(x) for x in sequence
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] # Put the result of double(x) in a new list, for each of the values in `sequence`
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doubled = map(double, sequence)
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print(list(doubled))
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‎19_unpacking_arguments/code.py

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Original file line numberDiff line numberDiff line change
@@ -10,7 +10,7 @@ def multiply(*args):
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print(multiply(3, 5))
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print(multiply(-1))
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# The asterisk takes all the parameters and packs them into a tuple.
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# The asterisk takes all the arguments and packs them into a tuple.
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# The asterisk can be used to unpack sequences into arguments too!
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@@ -33,30 +33,6 @@ def add(x, y):
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print(add(**nums))
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# -- Unpacking kwargs --
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def named(**kwargs):
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print(kwargs)
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named(name="Bob", age=25)
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# named({"name": "Bob", "age": 25}) # Error, the dictionary is actually a positional argument.
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named(
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**{"name": "Bob", "age": 25}
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) # Unpack dict into arguments. This is OK, but slightly more confusing. Good when working with variables though.
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# -- Unpacking and repacking --
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def named(**kwargs):
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print(kwargs)
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def print_nicely(**kwargs):
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named(**kwargs) # Unpack the dictionary into keyword arguments.
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for arg, value in kwargs.items():
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print(f"{arg}: {value}")
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print_nicely(name="Bob", age=25)
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# -- Forced named parameter --
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@@ -79,33 +55,3 @@ def apply(*args, operator):
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print(apply(1, 3, 6, 7, operator="+"))
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print(apply(1, 3, 5, "+")) # Error
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# -- Both --
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def both(*args, **kwargs):
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print(args)
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print(kwargs)
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both(1, 3, 5, name="Bob", age=25)
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# This is normally used to accept an unlimited number of arguments and keyword arguments, such that some of them can be passed onto other functions.
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# You'll frequently see things like these in Python code:
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"""
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def post(url, data=None, json=None, **kwargs):
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return request('post', url, data=data, json=json, **kwargs)
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"""
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# While the implementation is irrelevant at this stage, what it allows is for the caller of `post()` to pass arguments to `request()`.
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# -- Error when unpacking --
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def myfunction(**kwargs):
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print(kwargs)
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myfunction(**"Bob") # Error, must be mapping
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myfunction(**None) # Error

‎1_variables/code.py

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Original file line numberDiff line numberDiff line change
@@ -1,4 +1,4 @@
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# -- Numbers and Decimals --
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# -- Numbers and Floats --
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x = 15
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price = 9.99
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# -- Strings --
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name = "Rolf"
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name = "Rolf"
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print(name)
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b = 17
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# Here we've given the value '17' the name 'b'. The name 'a' still is a name for '25'!
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# Here we've given the value '17' the name 'b'. The name 'a' is still a name for '25'!
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print(a)
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print(b)

‎20_unpacking_keyword_arguments/code.py

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# -- Unpacking kwargs --
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def named(**kwargs):
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print(kwargs)
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named(name="Bob", age=25)
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# named({"name": "Bob", "age": 25}) # Error, the dictionary is actually a positional argument.
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# Unpack dict into arguments. This is OK, but slightly more confusing. Good when working with variables though.
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named(**{"name": "Bob", "age": 25})
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# -- Unpacking and repacking --
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def named(**kwargs):
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print(kwargs)
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def print_nicely(**kwargs):
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named(**kwargs) # Unpack the dictionary into keyword arguments.
20+
for arg, value in kwargs.items():
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print(f"{arg}: {value}")
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print_nicely(name="Bob", age=25)
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# -- Both args and kwargs --
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def both(*args, **kwargs):
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print(args)
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print(kwargs)
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both(1, 3, 5, name="Bob", age=25)
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# This is normally used to accept an unlimited number of arguments and keyword arguments, such that some of them can be passed onto other functions.
38+
# You'll frequently see things like these in Python code:
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40+
"""
41+
def post(url, data=None, json=None, **kwargs):
42+
return request('post', url, data=data, json=json, **kwargs)
43+
"""
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45+
# While the implementation is irrelevant at this stage, what it allows is for the caller of `post()` to pass arguments to `request()`.
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# -- Error when unpacking --
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def myfunction(**kwargs):
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print(kwargs)
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myfunction(**"Bob") # Error, must be mapping
55+
myfunction(**None) # Error

‎20_object_oriented_programming/code.py renamed to ‎21_object_oriented_programming/code.py

File renamed without changes.

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