str没有转换为float / int，因为它没有像数字一样忽略'\ n'-python

如何解决str没有转换为float / int，因为它没有像数字一样忽略'\ n'-python

我正在做一些自学，遇到了这个问题。

def main():

    golf = open('golf.txt','w')

    name = not('end')

    while name != 'end':
        name = input("Enter players name or 'end'  to quit ")
        score = float(input('Enter score '))
    
        golf.write(name + '\n')
        golf.write(str(score) +'\n')
        name = input("Enter players name or 'end'  to quit ")
    
    golf.close()

    golf=open('golf.txt','r')

    name = golf.readline()

    while name !='':
        score = float(golf.readline()) #ValueError#
        name = name.rstrip('\n')
    
    print(name,': ',score)
    golf.close()

main()

Enter players name or 'end'  to quit ted
Enter score 100
Enter players name or 'end'  to quit end
---------------------------------------------------------------------------
ValueError                                Traceback (most recent call last)
<ipython-input-6-b71bcadf2947> in <module>
     27     golf.close()
     28 
---> 29 main()
     30 
     31 

<ipython-input-6-b71bcadf2947> in main()
     21 
     22     while name !='':
---> 23         score = float(golf.readline())
     24         name = name.rstrip('\n')
     25 

ValueError: could not convert string to float: 

********changed float to int below**********

Enter players name or 'end'  to quit ted
Enter score 100
Enter players name or 'end'  to quit end
---------------------------------------------------------------------------
ValueError                                Traceback (most recent call last)
<ipython-input-7-8bffc375cbfa> in <module>
     27     golf.close()
     28 
---> 29 main()
     30 
     31 

<ipython-input-7-8bffc375cbfa> in main()
     21 
     22     while name !='':
---> 23         score = int(golf.readline())
     24         name = name.rstrip('\n')
     25 

ValueError: invalid literal for int() with base 10: '100.0\n'

我为此收到ValueError，我不明白。如果我将float更改为int，则可以进一步了解它不能完全转换的内容：“ 10 \ n”。似乎并没有像许多数字那样忽略逃生。尝试刷新我的内核，一切仍然一无所有。我不应该带一个字符串号...

解决方法

如果您有任何其他错误或疑问，请尝试并发布

def main():
    name = ""
    with open("golf.txt","w") as golf:
        while name != "end":
            name = input("Enter player's name or 'end' to quit: ")
            if name != "end":
                score = input("Enter score: ")
    
                golf.write(name + "\n")
                golf.write(score + "\n")
    
    with open("golf.txt") as golf:
        text = golf.read().split("\n")

    for i in range(0,len(text),2):
        try:
            name = text[i]
            score = text[i+1]
        except IndexError:
            break
        print(f"{name}: {score}")


main()

---

f字符串

使用这些，以便您可以在python中的字符串内传递变量。 f字符串是python 3.6中引入的，您可以这样编写它们

string = f"Something here {variable}"

# You can also do the same in older versions by using '.format()'
string = "Something here {}".format(variable)

Here is a link to read more about string formatting and f-strings from "RealPython"

---

您可以从许多来源中了解和。

Here is a link to read about the with keyword from "GeeksforGeeks"

---

尝试/除外

try/except块捕获可能发生的错误，并在该错误发生时执行代码。因此，当IndexError大于i+1时将发生len(text)，因此发现我使用了try/except块。

Here is a link to read more about it from "W3Schools"

---

休息

break用于希望过早停止运行循环而不执行break语句后的行。之所以使用它，是因为发生IndexError时，它意味着列表已解析，并且我们无法打印分数或名称，因此我们需要退出循环。

Here is a link to read more about it from "Programiz"

---

ValueError也不再发生，因为score变量将始终是一个字符串，因为它没有进行任何计算。但是，您可以在创建text变量后将其转换为浮点数。