Why my program does not run second for loop?

Question

I was trying to make baseball game that counts strike and ball. For example, if random_number is '835' and user_input_number is '853', strike_count should be 1, ball_count should be 2. And this function is only for counting strike and ball. But the program does not run the second for loop for counting ball. So I can't count ball.

def get_strikes_or_ball(user_input_number, random_number):

    random_number_list = list(random_number)
    print("random_number_list: ", random_number_list)
    user_input_number_list = list(user_input_number)
    print("user_input_number_list: ", user_input_number_list)

    strike_count = 0

    for i in range(0, 3):
        print("first for")
        if random_number_list[i] == user_input_number_list[i]:
            strike_count += 1

    print("start")

    ball_count = 0

    for i in range(2, -1):
        print("second for")
        for k in range(1, 3):
            if random_number_list[i] == user_input_number_list[i-k]:
                ball_count += 1

    print("st, ball: ", strike_count, ball_count)
    result = [strike_count, ball_count]

    # ==================================
    return result

Try printing [x for x in range(2, -1)]

Eugene Sh.
– Eugene Sh.

2018-02-27 18:17:26 +00:00
Commented Feb 27, 2018 at 18:17 — Eugene Sh.
– Eugene Sh., Commented Feb 27, 2018 at 18:17

Eugene Sh. · Accepted Answer · 2018-02-27 18:22:51Z

1

The range range(2, -1) is empty. If you want to get the reversed range [-1, 2) you can use reversed(range(-1, 2)).

edited Feb 27, 2018 at 18:22

answered Feb 27, 2018 at 18:20

Eugene Sh.

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1 Comment

user3483203 Over a year ago

You can also use for i in range(2, -1, -1)

ChootsMagoots · Accepted Answer · 2018-02-27 18:22:30Z

0

Python's range function accepts 3 parameters, two of which are optional. Start, stop, and step. Start and step are optional. The default for start is 0, and the default for step is 1. If you want to step in the negative direction, you need to pass -1 for step. Replacing range(2, -1) with range(2, -1, -1) should solve your problem, and this will be more efficient than using the reversed() function.

answered Feb 27, 2018 at 18:22

ChootsMagoots

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Comments

Harsh Bhut · Accepted Answer · 2018-02-27 18:25:33Z

In for loop parameter, there are three parameters in python for(start, stop(excluded number), step) there must be compulsory to define stop in loop if you don't specify it will get your third parameter as the second parameter and if you have to decrement the value of loop then you must give step as -1 it decrements as value -1 each time.

def get_strikes_or_ball(user_input_number, random_number):

random_number_list = list(random_number)
print("random_number_list: ", random_number_list)
user_input_number_list = list(user_input_number)
print("user_input_number_list: ", user_input_number_list)

strike_count = 0

for i in range(0, 3):
    print("first for")
    if random_number_list[i] == user_input_number_list[i]:
        strike_count += 1

print("start")

ball_count = 0

for i in range(2, -1,-1):
    print("second for")
    for k in range(1, 3):
        if random_number_list[i] == user_input_number_list[i-k]:
            ball_count += 1

print("st, ball: ", strike_count, ball_count)
result = [strike_count, ball_count]

# ==================================
return result

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