我正在为学校编写一个ATM程序。我一直在进行大量的研究，试图弄清楚为什么当我的数字是100.00时，当他们被当作字符串时，他们变成了100.0。我尝试过很多不同的东西，但总是会出错。
import sys
#account balance
acct_bal = float(500.25)
deposit_amount = float(0.00)
balance = float(0.00)
withdrawal_amount = float(0.00)
#<--------functions go here-------------------->
#printbalance function, choice B
def account_balance(acct_bal):
print("Your current balance:")
print(acct_bal)
#deposit function, choice D
def deposit(deposit_amount, balance):
print("Deposit was $" + str(float(deposit_amount)) + ", current balance is $" + str(float(balance)))
#print("Deposit was $" + "{:,.2f}".format(deposit_amount) + ", current balance is $" + "{:,.2f}".format(balance))
#This one causes an error
#Traceback (most recent call last):
#File "G:/SNHU/1 - CURRENT/IT-140 Introduction to Scripting Python (10-30-17 to 12-24-17)/Module 5/ATM", line 29, in <module>
#deposit(deposit_amount, balance)
#File "G:/SNHU/1 - CURRENT/IT-140 Introduction to Scripting Python (10-30-17 to 12-24-17)/Module 5/ATM", line 17, in deposit
#print("Deposit was $" + "{:,.2f}".format(deposit_amount) + ", current balance is $" + "{:,.2f}".format(balance))
#ValueError: Unknown format code 'f' for object of type 'str'
#withdraw function, choice W
def withdrawal(withdrawal_amount, balance):
print("Withdrawal amount was $" + str(float(withdrawal_amount)) + ", current balance is $" + str(float(balance)))
#User Input goes here, use if/else conditional statement to call function based on user input
userchoice = input("What would you like to do?\n")
if (userchoice == "D"):
deposit_amount = input("How much would you like to deposit today?\n")
balance = acct_bal + float(deposit_amount)
deposit(deposit_amount, balance)
elif (userchoice == "B"):
account_balance(acct_bal)
else:
withdrawal_amount = input("How much would you like to withdraw?\n")
balance = acct_bal - float(withdrawal_amount)
withdrawal(withdrawal_amount, balance)
这是输出我得到：
What would you like to do?
W
How much would you like to withdraw?
100
Withdrawal amount was $100.0, current balance is $400.25
应>
Withdrawal amount was $100.00, current balance is $400.25
过程中，如果您正在使用Python 3.X然后退出代码为0
