如何修复“Python Return Method”不返回串联字符串中的整数

Question

当代码运行时，它会输出，但不是按要求输出，它会在所有百分比上返回空白

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，调用每个方法时都应该输出百分比。 但这就是我得到的。你知道吗

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？你知道吗

Answer 1

原始输入在这里返回的是一个字符串，而不是整数，因此您必须将income变量转换为int，并且在无法转换时返回错误句柄。你知道吗

因为收入是一根弦。这里的细微错误是乘法。在python2中，整数除法返回向下舍入的整数。这意味着55/100将返回0，而不是0.55。你需要浮点除法，所以55.0//100会给你.55。你知道吗

基本上，你的收入输入（一个字符串）乘以0。在python中，字符串乘以值x会将字符串重复x次。所以，这里有一个空白字符串。你知道吗

Answer 2

代码非常清楚：income返回一个字符串。您对字符串的“算术”返回一个空字符串。在返回之前将其转换为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 3

你面临的问题是双重的。你知道吗

原始输入的输入类型是字符串，没有错误，因为

print "tata" * 2     # tatatata

是一个有效的字符串表示法-一直乘以0，因此得到空字符串：''。你知道吗

其次，需要调整除法以返回浮点值。你知道吗

固定代码：

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)

您将得到浮点不准确性-请参见Is floating point math broken?-您可以使用round(3.2222,2)四舍五入到2位小数。你知道吗