如何修复“ Python Return 方法不返回串联字符串中的整数

Question

当代码为运行时，它会输出，但未按要求输出，它 returns 在所有百分比上都是空白的

def income():
    num= raw_input("Enter your Income: ")
    print "Your income is: %d " % int(num)
    return num
income= income()

def bills_expenses():
    bills_kitty=0
    bills_kitty=(income*(55/100))
    return  ("Your bills kitty should have: ", bills_kitty)

def long_term_savings():
    long_term_savings_kitty=(10/100)*income
    return "Your long term kitty should have: ",  long_term_savings_kitty

def play_and_leisure():
    play_and_leisure_kitty=(10/100)*income
    return "Your play and leisure kitty should have: " , play_and_leisure_kitty


def education_personal_growth():
    education_personal_growth_kitty=(10/100)*income
    return "Your personal growth  kitty should have: ", education_personal_growth_kitty


def pay_myself_Financial_fredom():
    pay_myself_Financial_fredom_kitty=(10/100)*income
    return "Your pay yourself kitty should have: ", pay_myself_Financial_fredom_kitty

def give_back_to_the_community():
    give_back_to_the_community_kitty=(5/100)*income
    return "Your giving back kitty should have: " , give_back_to_the_community_kitty



bills=bills_expenses()
long_term = long_term_savings()
play=play_and_leisure()
education=education_personal_growth()
mine=pay_myself_Financial_fredom()
give=give_back_to_the_community()


print bills
print long_term
print play
print education
print mine
print give

预期的结果是每个方法在调用时都应该输出百分比。但这就是我得到的。

Enter your Income: 200
Your income is: 200
('Your bills kitty should have: ', '')
('Your long term kitty should have: ', '')
('Your play and leisure kitty should have: ', '')
('Your personal growth  kitty should have: ', '')
('Your pay yourself kitty should have: ', '')
('Your giving back kitty should have: ', '')

我错过了什么？

Answer 1

代码很清楚：income returns一个字符串。你的 "arithmetic" 上的字符串 returns 是一个空字符串。返回前将其转换为 int。另外，不要重载变量 income:

def get_income():
    num = int(raw_input("Enter your Income: "))
    print "Your income is: %d " % num
    return num

income = get_income()

Answer 2

您面临的问题是双重的。

你输入的 raw_input 的类型是字符串，你没有得到错误，因为

print "tata" * 2     # tatatata

是一个有效的字符串表示法 - 你一直乘以 0，所以你得到空字符串：''.

其次，您需要将除法调整为 return 浮点数。

固定码：

def get_income(): # See Prunes post
    num = float(raw_input("Enter your Income: "))
    print "Your income is: %d " % int(num)
    return num

income= get_income()

print(type(income))

def bills_expenses():
    bills_kitty=0
    bills_kitty=(income*(55/100.0))
    return  ("Your bills kitty should have: ", bills_kitty)

def long_term_savings():
    long_term_savings_kitty=(10/100.0)*income
    return "Your long term kitty should have: ",  long_term_savings_kitty

def play_and_leisure():
    play_and_leisure_kitty=(10/100.0)*income
    return "Your play and leisure kitty should have: " , play_and_leisure_kitty

def education_personal_growth():
    education_personal_growth_kitty=(10/100.0)*income
    return "Your personal growth  kitty should have: ", education_personal_growth_kitty

def pay_myself_Financial_fredom():
    pay_myself_Financial_fredom_kitty=(10/100.0)*income
    return "Your pay yourself kitty should have: ", pay_myself_Financial_fredom_kitty

def give_back_to_the_community():
    give_back_to_the_community_kitty=(5/100.0)*income
    return "Your giving back kitty should have: " , give_back_to_the_community_kitty

bills=bills_expenses()
long_term = long_term_savings()
play=play_and_leisure()
education=education_personal_growth()
mine=pay_myself_Financial_fredom()
give=give_back_to_the_community()


print bills
print long_term
print play
print education
print mine
print give

输出：

Enter your Income: Your income is: 200 
<type 'float'>
('Your bills kitty should have: ', 110.00000000000001)
('Your long term kitty should have: ', 20.0)
('Your play and leisure kitty should have: ', 20.0)
('Your personal growth  kitty should have: ', 20.0)
('Your pay yourself kitty should have: ', 20.0)
('Your giving back kitty should have: ', 10.0)

您将得到浮点数不准确 - 参见 Is floating point math broken? - 您可以使用 round(3.2222,2) 舍入到 2 位小数。

Answer 3

raw_input这里返回的是一个字符串，不是一个整数，所以你必须将income变量转换成一个int，不能转换时的错误处理。

由于收入是一个字符串，.这里的细微错误在于乘法。在python2中，整数除法returns四舍五入的整数。这意味着 55/100 将返回 0，而不是 0.55。你需要浮点数除法，所以 55.0//100 会给你 .55.

本质上，您是将收入输入（字符串）乘以 0。字符串乘以 python 中的值 x 会重复字符串 x 次。所以，你在这里得到一个空字符串。

Answer 4

只是return作为int的收入

return int(num)

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