Python 3.7.1“ ValueError：無法將字符串轉換為float：”

Question

我嘗試讀取文件的內容並將其保存為變量，並嘗試將其轉換為float並-

Traceback (most recent call last):
  File "/Users/username/wageCalculator.py", line 26, in <module>
    writeTotal.write(str(float(total)+float(getBal)))
TypeError: float() argument must be a string or a number, not '_io.TextIOWrapper

這是編輯后的代碼：（更改的目錄名稱）年齡

import time
while True:
    wage = 5
    moneyPerSecond=(int(wage)/3600)
    moneyPerMinute=(int(wage)/60)
    print('Your wage per second is: $'+str(moneyPerSecond))
    print('Please input the amount of minutes you worked. It must be a whole number.')
    minutesWorked = input()
    minuteWage = int(minutesWorked)*float(moneyPerMinute)
    print('Please input the amount of seconds you worked. It can be a decimal.')
    secondsWorked = input()
    secondWage = float(secondsWorked)*float(moneyPerSecond)
    print('Your total is: $' + str(float(minuteWage)+float(secondWage)))
    total = float(minuteWage)+float(secondWage)
    getBal = open('/Users/username/balance.txt','r+')
    readBal = getBal.read()
    getBal.close()
    print('Current balance: $' + str(readBal))
    print('Do you want to add this to your balance?')
    print('Key in "y" for yes or "n" for no and press enter:')
    yesOrNo = input()
    if yesOrNo=='y':
        open('/Users/username/balance.txt','w').close
        writeTotal = open('/Users/username/balance.txt' ,'a')
        writeToLog = open('/Users/username/balanceLog.txt','a')
        writeToLog.write(str(total))
        writeTotal.write(str(float(total)+float(readBal)))
        writeTotal.close()
        writeToLog.close()
    elif yesOrNo=='n':
        print('Reseting...')
        time.sleep(1)
    else:
        print('Please try again.')

我曾嘗試將其轉換為字符串，但它給了我同樣的錯誤。

任何人都能找到答案，那就太好了。 ：p

編輯：我已經嘗試過getBal和readBal，而readBal給了我這個錯誤：

Traceback (most recent call last):
  File "/Users/Jonathan_Xu/wageCalculator.py", line 27, in <module>
    writeTotal.write(str(float(total)+float(readBal)))
ValueError: could not convert string to float:

Answer 1

錯誤中的代碼行與發布的代碼不匹配：

writeTotal.write(str(float(total)+float(getBal)))

與

writeTotal.write(str(float(total)+float(readBal)))

大概您打算使用float(readBal) 。