如何在 python 中换行？

Question

这是我关于 Whosebug 的第一个问题。我正在尝试在 Python 中在线 OCW 类上做习题集，但我不知道如何调试我的代码。我使用 IDLE，并且 Python 2.7.

这是我的代码：

balance = float(raw_input("Enter the outstanding balance on your credit card: "))
annual_itst = float(raw_input("Enter the annual credit card interest rate as a decimal: "))
min_paymt_rate = float(raw_input("Enter the minimum monthly payment rate as a decimal: "))

remaining_balance = balance

for i in range(1,13):
    min_monthly_paymt=min_paymt_rate*remaining_balance
    inst_paid = (annual_itst / 12.0 )*remaining_balance
    pcpl_paid = min_monthly_pamt - inst_paid
    remaining_balance -= pcpl_paid

print("Month: " & i, \n "Minimum monthly payment: " & "$" & round(min_monthly_paymt, 2), \n "Principle paid: " & "$" & round(pcpl_paid, 2),
      \n "Remaining balance: " & "$" & round(remaining_balance, 2))

当我执行它时，我在 print 函数的第一行之后收到一条消息错误 "unexpected character after line continuation character"，红色突出显示。感谢您的帮助！

Answer 1

要打印换行符，请使用包含换行符的字符串："\n"。

要打印出您想要的复杂字符串，您可以使用多个 print 语句（通常会添加它们自己的换行符），或者 assemble 您的字符串然后打印它。

print("Month:", i)
print("Minimum monthly payment: $" + round(min_monthly_paymt, 2))
(etc.)

您可以将字符串加在一起形成更长的字符串，但不能将字符串和整数加在一起。为此，您需要将数字转换为字符串或了解格式化语句。

数字到字符串：

print "Month: "+str(i)

字符串格式：

report = """Month: %d
Minimum monthly payment: $%.2f
Principal paid: $%.2f
Remaining balance: %.2f"""

print report % (i, min_monthly_paymt, pcpl_paid, remaining_balance)

阅读所有这些方法；它们在不同情况下很有用。

Answer 2

在这里，了解运算符和格式以打印输出

balance = float(raw_input("Enter the outstanding balance on your credit card: "))
annual_itst = float(raw_input("Enter the annual credit card interest rate as a decimal: "))
min_paymt_rate = float(raw_input("Enter the minimum monthly payment rate as a decimal: "))

remaining_balance = balance

for i in range(1,13):
    min_monthly_paymt=min_paymt_rate*remaining_balance
    inst_paid = (annual_itst / 12.0 )*remaining_balance
    pcpl_paid = min_monthly_paymt - inst_paid
    remaining_balance -= pcpl_paid
print "\n\n\n"
print "Month: {}".format(i), '\n',"Minimum monthly payment: $ {}".format(round(min_monthly_paymt, 2)), '\n',"Principle paid:$ ".format(round(pcpl_paid, 2)),'\n',"Remaining balance: $".format(round(remaining_balance, 2))

Answer 3

您必须将 int 转换为 string 才能连接，并且您可以分别打印每一行以在不同的行中打印。

balance = float(raw_input("Enter the outstanding balance on your credit card: "))
annual_itst = float(raw_input("Enter the annual credit card interest rate as a decimal: "))
min_paymt_rate = float(raw_input("Enter the minimum monthly payment rate as a decimal: "))

remaining_balance = balance

for i in range(1,13):
    min_monthly_paymt=min_paymt_rate*remaining_balance
    inst_paid = (annual_itst / 12.0 )*remaining_balance
    pcpl_paid = min_monthly_paymt - inst_paid
    remaining_balance -= pcpl_paid

    print("Month: " + str(i))
    print("Minimum monthly payment: $" +str(round(min_monthly_paymt, 2)))
    print("Principle paid: $" + str(round(pcpl_paid, 2)))
    print("Remaining balance: $" + str(round(remaining_balance, 2)))

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