CODEWITHSUNDEEP
python-3.x
James H
James H

Reputation: 21

keep decimal places when cast a float to a string in Python

I'm writing an ATM program for school. I've been doing a lot of research trying to figure out why when my numbers are like 100.00 they become 100.0 when cast as strings. I've tried many different things but always get errors.

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)

This is the output I get:

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

Should be >

Withdrawal amount was $100.00, current balance is $400.25

Process finished with exit code 0

Upvotes: 1

Views: 4767

Answers (1)

Nex_Lite
Nex_Lite

Reputation: 378

if you are using python 3.x then there is a simple way to go about it.

value = 100.000

#the .2f specifys the number of trailing values after the decimal you want
final = "{:.2f}".format(value)

print(final)
#output:100.00
#NOTE: it will be in string
#if you want more formatting options you can check the python docs

Upvotes: 2

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