回答編集履歴
2
c
test
CHANGED
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@@ -73,3 +73,107 @@
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73
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print(s.format(**kv))
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```
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----
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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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84
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```Python
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88
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89
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# Compute a payment schedule
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90
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91
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92
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93
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DISCOUNT_RATE = 0.1
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95
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ANNUAL_INTEREST_RATE = 0.12
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96
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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 * \
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107
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(1 - DISCOUNT_RATE) # The price for members
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108
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info = {
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"month": 1,
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114
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"starting": discounted_price, # The current total balance owed
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116
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# the sum of interest and principal for that manth
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"monthly_payment": discounted_price * MONTHLY_PAYMENT_RATE,
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120
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"interest": discounted_price * MONTHLY_INTEREST_RATE,
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}
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info["principal"] = info["monthly_payment"] - info["interest"]
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# The balance remaining after payment
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info["remaining"] = info["starting"] - info["principal"]
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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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150
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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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152
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print(s.format(**info))
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154
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# Display the info of the second month and later
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160
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161
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while info["monthly_payment"] <= info["remaining"]:
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info["month"] += 1
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info["starting"] = info["remaining"]
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info["interest"] = info["starting"] * MONTHLY_INTEREST_RATE
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168
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info["principal"] = info["monthly_payment"] - info["interest"]
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info["remaining"] = info["starting"] - info["principal"]
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print(s.format(**info))
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```
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1
..
test
CHANGED
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@@ -13,3 +13,63 @@
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13
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14
14
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15
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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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----
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追記
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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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位置引数を使う場合。
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30
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31
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32
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33
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```Python
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s = "{:5d} {:16.2f} {:15.2f} {:16.2f} {:7.2f} {:14.2f}"
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38
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values = [1, 2.0, 3.0, 4.0, 5.0, 6.0]
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40
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print(s.format(*values))
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```
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44
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45
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46
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47
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キーワード引数を利用する場合。
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48
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49
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50
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51
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```Python
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52
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53
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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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54
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55
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56
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57
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kv = {
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58
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"month": 1,
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60
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61
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"starting": 2.0,
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62
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63
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"interest": 3.0,
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64
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65
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"principal": 4.0,
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66
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"monthly_payment": 5.0,
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68
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69
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"remaining": 6.0
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70
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71
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}
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72
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73
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print(s.format(**kv))
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74
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75
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+
```
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