how to fix when chatbot hangs

I am creating a chatbot based on The Talking NPC game in Roblox

it crashes after i type hello

error code
>Traceback (most recent call last):
File "/data/user/0/ru.iiec.pydroid3/files/accomp_files/iiec_run/iiec_run.py", line 31, in <module>
start(fakepyfile,mainpyfile)
File "/data/user/0/ru.iiec.pydroid3/files/accomp_files/iiec_run/iiec_run.py", line 30, in start
exec(open(mainpyfile).read(), main.dict)
File "<string>", line 21, in <module>
TypeError: can only concatenate str (not "int") to str

code

import random

print(" AI created by MThien \n")

sys = input(" [ System ]: My name is: ")

sys2 = 0
sys4 = 0

while True:
	user  = input(" [ " + str(sys) + " ]: ")
	
	sys1 = random.choice(["Hello!", "Hello there", "Hello " + str(sys), "Sup!", "Howdy!", "Wassup!"])
	sys2 = random.choice(["Wrong number, sorry.", "Apologize, my visitor is just having a mental breakdown."])
	sys3 = random.choice(["What?", "?", "Sorry?", "I don't understand", "I don't get it.", "Sry my English is bad.", "Sry my IQ is still low."])
	sys4 = random.choice(["...", "Stop it.", "You've already said hello to me several times.", "That's enough for greeting me."])

	if user == "hello":
		print(" [ AI ]: " + str(sys1))
		sys4 += 1
		if sys4 >= 5:
			print(" [ AI ]: "+ str(sys4)) 
	elif user == "/call":
		print(" [ Telephone ] : *dialing*")
		time.sleep(2)
		print(" [ Telephone ] : The number you're calling isn't registered.")
		time.sleep(1)
		print(" [ Telephone ] : *call ended*")
	elif user == "/call 911":
		print(" [ Telephone ] : *dialing*")
		time.sleep(2)
		print(" [ Telephone ] : 911, what's your emergency?")
		time.sleep(1)
		print(" [ AI ]: "+ str(sys1))
		time.sleep(1)
		print(" [ Telephone ] : *call ended*")
		sys2 += 1
		if sys2 == 3:
			time.sleep(3)
			print(" [ FBI ] : FBI, OPEN UP!")
			time.sleep(5)
			print(" [ System ]: You were kicked from this experience: You got arrested!")
			break
	else:
		print(" [ AI ]: " + str(sys3))```


</details>


# 答案1
**得分**: 1

你在不打算的情况下覆盖了你的值。让我们以用户输入的 `hello` 为例。在到达这个语句之前，你有两个语句：

sys4 = 0
sys4 = random.choice(["...", "Stop it.", "You've already said hello to me several times.", "That's enough for greeting me."])

当你到达第二个语句时，`sys4` 现在是一个字符串。然后你执行 `sys4 += 1`，你试图将 `1` 添加到一个字符串上。Python 不支持这样做，很明显你想要将 `1` 添加到 `sys4` 的整数版本而不是字符串版本。然而，`sys4` 不再存在为整数。

适当命名你的变量，问题应该就会消失。

<details>
<summary>英文:</summary>

You are overwriting your values when you likely don&#39;t intend to. Let&#39;s take a user input of `hello` for example. Prior to reaching this statement, you have two statements being

sys4 = 0
sys4 = random.choice(["...", "Stop it.", "You've already said hello to me several times.", "That's enough for greeting me."])

Once you hit that second statement, sys4 is now a string. You then get to `sys4 += 1`, where you are trying to add `1` to a string. Python does not support this, and it is obvious you were trying to add `1` to the integer version of `sys4` and not the string version. However, `sys4` no longer exists as an integer.

Properly name your variables and the problem should go away.

Also, the tags for `android` `artifical-intelligence`, and `roblox` are not relevant to this question.

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