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トップに関する質問f-stringの変数化

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2

追記

2019/04/18 02:56

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退会済みユーザー
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  ```
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-
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- # Programming Exercise 3.10
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  # Compute a payment schedule
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@@ -142,7 +140,7 @@
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- s = "{month:5d} {starting:16.2f} {interest:15.2f} {principal:16.2f} {monthly_payment:7.2f} {remaining:14.2f}"
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+
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  # Evaluate the remaining and display the info of the last month
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1

追記

2019/04/18 02:56

投稿

退会済みユーザー
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+ # f-stringの変数化
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  下記のようにf-stringを用いて複数の変数を表示するのですが、同じコードを条件分岐などで複数回使います。
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  f-stringのコードを変数として定義することはできないのでしょうか?
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+ # 追記
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+ プログラムは、リボ払いでの各月の金利や支払額を表のように出力するものです。
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+ month, startingなどはprintするごとに変化します。
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+ ```
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+ # Programming Exercise 3.10
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+ # Compute a payment schedule
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+ DISCOUNT_RATE = 0.1
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+ ANNUAL_INTEREST_RATE = 0.12
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+ MONTHLY_INTEREST_RATE = ANNUAL_INTEREST_RATE / 12
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+ MONTHLY_PAYMENT_RATE = 0.05
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+ original_price = float(input("Enter the purchase price: "))
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+ discounted_price = original_price * (1 - DISCOUNT_RATE) # The price for members
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+ month = 1
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+ starting = discounted_price # The current total balance owed
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+ monthly_payment = (
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+ discounted_price * MONTHLY_PAYMENT_RATE
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+ ) # the sum of interest and principal for that manth
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+ interest = discounted_price * MONTHLY_INTEREST_RATE
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+ principal = monthly_payment - interest
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+ remaining = starting - principal # The balance remaining after payment
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+ # display the titles of a table
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+ print(
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+ "\n"
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+ "Month Starting Balance Interest to Pay Principal to Pay Payment Ending Balance\n"
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+ "-----------------------------------------------------------------------------------"
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+ )
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+ # Display the info of the first month
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+ print(
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+ f"{month:5d} {starting:16.2f} {interest:15.2f} {principal:16.2f} {monthly_payment:7.2f} {remaining:14.2f}"
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+ )
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+ # Display the info of the second month and later
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+ while monthly_payment <= remaining:
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+ month += 1
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+ starting = remaining
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+ interest = starting * MONTHLY_INTEREST_RATE
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+ principal = monthly_payment - interest
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+ remaining = starting - principal
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+ print(
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+ f"{month:5d} {starting:16.2f} {interest:15.2f} {principal:16.2f} {monthly_payment:7.2f} {remaining:14.2f}"
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+ )
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+ s = "{month:5d} {starting:16.2f} {interest:15.2f} {principal:16.2f} {monthly_payment:7.2f} {remaining:14.2f}"
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+ # Evaluate the remaining and display the info of the last month
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+ if monthly_payment >= remaining:
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+ month += 1
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+ starting = remaining
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+ interest = 0
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+ principal = starting
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+ monthly_payment = starting
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+ remaining = 0
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+ print(
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+ f"{month:5d} {starting:16.2f} {interest:15.2f} {principal:16.2f} {monthly_payment:7.2f} {remaining:14.2f}"
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+ )
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+ ```