在python中添加一个计数器，每写一次name，它就增加1

Question

我希望每次有新买家时，买家编号都会更改

total = 200  # Assigns 200 tickets to variable total
sold = 0  # Assigns 0 tickets to variable sold
count = 0
while sold < total:  # Runs while loop as long as tickets sold is less than total tickets
remaining = total - sold  # Assigns total - sold to variable remaining
if sold == 0:  # If tickets are equal to 0
print("Welcome to Movies4Us!")  # Prints "Welcome to Movies4Us!" if condition above is satisfied
else:
print('You are buyer NO.', count + 1, "." "The number of remaining tickets is now", remaining, ".")  # Prints user's number and remaining amount of tickets
name = input('What is your name?: ')
tickets = input("How many tickets would you like to purchase?: ")  # Asks user to enter desired amount of tickets to purchase
try:
tickets = int(tickets)  # Converts variable tickets to integer type
if tickets > remaining:  # If user enters more tickets than remaining tickets available
print("Sorry, there aren't that many tickets available.")  # Prints no more tickets available
else:
sold += tickets  # Updates value of variable sold into tickets
print("You have purchased", tickets, "tickets, Enjoy the movie", name, '!')  # Prints the amount of tickets the user purchased
except ValueError:  # If user inputs anything except for an integer
print("Invalid input. Please enter a number.")  # Prints invalid input and asks user to input again
continue  # Ends current loop and runs the while loop again
print ("There are no more tickets available.")  # If number of tickets reached 0, program ends

尝试添加count = 0和count + 1

Answer 1

您已经初始化了一个计数器:count = 0。您只需要在每次有效购票时在循环中增加它。

在else块中添加count += 1，其中在语句sold += tickets下进行了有效的票务购买。这将在每次成功购买发生时增加计数器。

Answer 2

如果要更新count的值，最简单和最清晰的方法是在print语句之前的行更新它。或者，您可以在代码的其他部分更新sold的值。

if sold == 0:  # If tickets are equal to 0
print("Welcome to Movies4Us!")  # Prints "Welcome to Movies4Us!" if condition above is satisfied
else:
count += 1
print(f"You are buyer NO.{count}.", end=" ") # Use string interpolation
print(f"The number of remaining tickets is now {remaining}.")  # Prints user's number and remaining amount of tickets

我还更新了这个，使用f-string进行格式化，否则你会遇到count值和后面的"."之间有额外空格的问题。

如果你真的不希望count+=1有单独的行，可以在print语句中更新count inline，但前提是你不使用f-string，如果你使用:=操作符，因为print语句的参数必须是表达式，所以正常的赋值会导致语法错误:

print('You are buyer NO.', count := count +1, ". The number of remaining tickets is now", remaining, ".")  # Prints user's number and remaining amount of tickets