回答編集履歴
2
c
answer
CHANGED
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@@ -35,4 +35,56 @@
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35
35
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"remaining": 6.0
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36
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}
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37
37
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print(s.format(**kv))
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38
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+
```
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39
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40
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41
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----
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42
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キーワード引数を使う場合だと、例えば一つの変数info(dictクラス)に情報を集約しておく、などですかね。
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43
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44
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```Python
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45
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# Compute a payment schedule
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46
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47
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DISCOUNT_RATE = 0.1
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48
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ANNUAL_INTEREST_RATE = 0.12
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49
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MONTHLY_INTEREST_RATE = ANNUAL_INTEREST_RATE / 12
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50
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MONTHLY_PAYMENT_RATE = 0.05
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51
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52
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original_price = float(input("Enter the purchase price: "))
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53
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discounted_price = original_price * \
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54
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(1 - DISCOUNT_RATE) # The price for members
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55
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56
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info = {
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57
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"month": 1,
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58
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"starting": discounted_price, # The current total balance owed
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59
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# the sum of interest and principal for that manth
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60
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"monthly_payment": discounted_price * MONTHLY_PAYMENT_RATE,
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"interest": discounted_price * MONTHLY_INTEREST_RATE,
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62
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}
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63
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info["principal"] = info["monthly_payment"] - info["interest"]
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64
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# The balance remaining after payment
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65
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info["remaining"] = info["starting"] - info["principal"]
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66
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67
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# display the titles of a table
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68
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print(
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69
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"\n"
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70
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"Month Starting Balance Interest to Pay Principal to Pay Payment Ending Balance\n"
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71
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"-----------------------------------------------------------------------------------"
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72
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)
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73
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74
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75
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# Display the info of the first month
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76
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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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77
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print(s.format(**info))
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78
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79
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80
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# Display the info of the second month and later
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81
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while info["monthly_payment"] <= info["remaining"]:
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82
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info["month"] += 1
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83
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info["starting"] = info["remaining"]
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84
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info["interest"] = info["starting"] * MONTHLY_INTEREST_RATE
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85
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info["principal"] = info["monthly_payment"] - info["interest"]
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86
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info["remaining"] = info["starting"] - info["principal"]
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87
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88
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print(s.format(**info))
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89
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38
90
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```
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1
..
answer
CHANGED
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@@ -5,4 +5,34 @@
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5
5
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print(s.format(month=...))
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6
6
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```
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7
7
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8
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-
というように、テンプレートとしての文字列sを一個作って、あとから必要な場所で.formatメソッドを呼ぶ形にすればテンプレートsを使いまわすことができます。
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8
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というように、テンプレートとしての文字列sを一個作って、あとから必要な場所で.formatメソッドを呼ぶ形にすればテンプレートsを使いまわすことができます。
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9
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10
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----
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11
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追記
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12
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13
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print部分を短くするだけなら次のような方法があります。
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14
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15
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位置引数を使う場合。
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16
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17
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```Python
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18
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s = "{:5d} {:16.2f} {:15.2f} {:16.2f} {:7.2f} {:14.2f}"
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19
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20
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values = [1, 2.0, 3.0, 4.0, 5.0, 6.0]
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21
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print(s.format(*values))
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22
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```
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23
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+
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24
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キーワード引数を利用する場合。
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25
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+
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26
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```Python
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27
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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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28
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29
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kv = {
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30
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"month": 1,
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31
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"starting": 2.0,
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32
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"interest": 3.0,
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33
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"principal": 4.0,
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34
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"monthly_payment": 5.0,
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35
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"remaining": 6.0
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36
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}
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37
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print(s.format(**kv))
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38
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```
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