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Commit4a1e414

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simplified hints
1 parente9cf80b commit4a1e414

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‎backend/main/chapters/c06_lists.py‎

Lines changed: 30 additions & 47 deletions
Original file line numberDiff line numberDiff line change
@@ -895,11 +895,11 @@ def program(self):
895895
print(x)
896896

897897
hints="""
898-
Moving the first element to the end requires two things: removingthefirst element, andadding it to the end.
899-
Which function/method can remove and returnthefirst element?
900-
Then which function/method can add thatelement to the end?
901-
You needtouse `pop` and `append`.
902-
Make sureyouchoose the line that applies these two operations in the right order!
898+
Your solution should have exactly three statements: `x = ['a', 'b', 'c']`, then one line copied exactly fromthelist (no additions), and`print(x)`.
899+
Moving the first element totheend requires two things.
900+
Removing the firstelement...
901+
and adding ittothe end.
902+
Which functions/methods canyouuse for this?
903903
"""
904904

905905
classsubscript_assignment_exercise(VerbatimStep):
@@ -923,12 +923,11 @@ def program(self):
923923
print(x)
924924

925925
hints="""
926-
Which function/method allows you to assign a value to a specific position in the list?
927-
You need to use subscript assignment.
928-
How do you assign a value to the last position in `x`?
929-
You need to use `len(x)` to access the last element.
930-
Which line in the list above involving `len(x)` accesses the last position correctly?
931-
Remember the list index starts counting from 0.
926+
Your solution should have exactly three statements: `x = ['a', 'b', 'c']`, then one line copied exactly from the list (no additions), and `print(x)`.
927+
You need to get the value of the first element in `x`...
928+
and assign that value to the last position in `x`.
929+
Which function/method allows you to assign a value at a specific index in the list?
930+
How can you access the first and last elements in `x`?
932931
"""
933932

934933
classnegative_index_concatenation_exercise(VerbatimStep):
@@ -966,13 +965,10 @@ def program(self):
966965
print(y)
967966

968967
hints="""
968+
Your solution should have exactly three statements: `x = ['a', 'b', 'c']`, `y = ` followed by one line copied exactly from the list, and `print(y)`.
969969
Which function/method allows you to create a new list?
970-
You may be tempted to use `append` but that modifies the original list `x`.
971-
You need to use `+`. Remember this requires two lists.
972-
Start with the original list `x`. Then add another list to it.
973-
How do you get the first element of `x`? And then turn it into a second list?
974-
`x.pop(0)` will give us the first element, but it modifies the original list, which we need unchanged.
975-
Which line from the list above correctly turns the first element into a second list?
970+
Start with the original list `x`.
971+
Then add something to it.
976972
"""
977973

978974
classremove_exercise(VerbatimStep):
@@ -995,12 +991,11 @@ def program(self):
995991
print(x)
996992

997993
hints="""
998-
`x.remove(0)` finds the first occurrence of `0` in `x` and removes it.
999-
What other function/method can remove an element from a list?
1000-
`pop` can remove an element, but it requires an index.
1001-
Is there a function/method that can find the index of the first occurrence of an element?
1002-
`index` can do that.
1003-
Which line from the list above applies these two operations in the correct order?
994+
Your solution should have exactly three statements: `x = [1, 2, 0, 3]`, one line copied exactly from the list (no additions), and `print(x)`.
995+
What does `x.remove(0)` do?
996+
Which function/method can do the same thing?
997+
Does that function/method need something else to work?
998+
Maybe another function/method?
1004999
"""
10051000

10061001
final_text="""
@@ -1062,12 +1057,9 @@ def program(self):
10621057
print(x.count(1)>0)
10631058

10641059
hints="""
1065-
`1 in x` is `True` if `x` contains the number `1`, `False` otherwise.
1066-
What other function/method can tell us if `x` contains `1`?
1067-
`count` can do that.
1068-
Which line from the list above involving `count` correctly detects `1 in x`?
1069-
If `x` contains `1`, then the count of `1` should be at least one.
1070-
That is, it must be greater than zero.
1060+
Your solution should have exactly two statements: `x = [1, 2, 0, 3]` and `print()` where one line is copied exactly from the list above and put inside the parentheses.
1061+
When is `1 in x` true?
1062+
What other function/method can tell us the same thing? And how?
10711063
"""
10721064

10731065
classaverage_exercise(VerbatimStep):
@@ -1091,12 +1083,10 @@ def program(self):
10911083
print(y)
10921084

10931085
hints="""
1086+
Your solution should have exactly three statements: `x = [15, 12, -6, 3]`, `y = ` followed by one line copied exactly from the list, and `print(y)`.
10941087
To calculate the average of numbers in `x` we need two things.
1095-
We need to add up all the numbers in `x`, and we need how many numbers in `x` there are.
1096-
Which two functions/methods can do that?
1097-
`sum` and `len`.
1098-
Which line from the list above correctly calculates the average?
1099-
The average is calculated by dividing the total sum by the number of elements.
1088+
Which two functions/methods can do those?
1089+
How do you use those two together, to calculate the average?
11001090
"""
11011091

11021092
classsum_range_exercise(VerbatimStep):
@@ -1120,14 +1110,9 @@ def program(self):
11201110
print(y)
11211111

11221112
hints="""
1123-
One function/method we need to use is already mentioned in the exercise.
1124-
It's `sum`. Which other function/method do we need?
1125-
How can we `sum` the numbers `1, 2, 3, ..., x`? If only we had a list of these numbers.
1126-
Since we are adding them up, a list of the numbers `0, 1, 2, 3, ..., x` would also work.
1127-
Which function/method gives us something similar to the list of numbers `0, 1, 2, 3, ..., x`?
1128-
Remember that `range(x)` is similar to `[0, 1, 2, ..., x - 1]`.
1129-
That's very close to what we need, but not quite.
1130-
Which line from the list above correctly uses `range` to give us `[0, 1, 2, ..., x]`?
1113+
Your solution should have exactly three statements: `x = 100`, `y = ` followed by one line copied exactly from the list, and `print(y)`.
1114+
What function/method can be used to add up things?
1115+
Which function/method gives us something similar to the list of numbers `1, 2, 3, ..., x`?
11311116
"""
11321117

11331118
classsecond_smallest_in_list_exercise(VerbatimStep):
@@ -1151,11 +1136,9 @@ def program(self):
11511136
print(y)
11521137

11531138
hints="""
1154-
To find the second smallest value in `x` we can order the numbers in `x` from smallest to largest.
1155-
Which function/method can order the numbers in `x` like that?
1156-
It's `sorted`.
1157-
Then how do we access the *second* element in `sorted(x)`?
1158-
Remember the list index starts counting from 0.
1139+
Your solution should have exactly three statements: `x = [12, -6, 2, -1, 3]`, `y = ` followed by one line copied exactly from the list, and `print(y)`.
1140+
The numbers in `x` seem to be all out of order. Can you do something about that?
1141+
After that, how can you get the *second* smallest value?
11591142
"""
11601143

11611144
final_text="""

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