类型错误：只能连接列表(不能连接"str")到列表：Python

Question

我正在尝试冒泡排序温度阵列，但我得到这种错误…谁来帮我解决这个问题:)

代码如下:

print("")
print("")
days = ["Sunday", "Monday", "Tuesday", "Wednesday", "Thrusday", "Friday", "Saturday"]
temperature = []
highest = float(0.0)
lowest = float(100.0)
total = float(0.0)  
for i in range(7):
inp = round(float(input("Please enter the temperature for " + days[i] + " in Celcus: ")),1)
temperature.append(inp)


print("")
print("")

print("You entered these Temperatures in Celsius and Fahrenheit.")
print("")
print("")

for j in range(len(temperature)):

def bubble_sort(tem):
for a in range(len(tem)):
for b in range(len(tem)-1):
if(tem[b]>tem[b+1]):
temp=tem[b]
tem[b]=tem[b+1]
tem[b+1]=temp
return tem
arr = []
arr.append(temperature[j])
Fahrenheit = round(((temperature[j] * 1.8) + 32),1)
total = total + temperature[j]
print(bubble_sort(arr) + " C° is " + str(Fahrenheit) + " F°" )

print("--------------------")
avg = round(total / len(temperature),1)
print("High Temp: " + str(max(temperature)) + "C°, Low Temp: " + str(min(temperature)) + " C° Average Temp: " + str(avg) + " C°")

我不明白这段代码有什么问题。

Answer 1

错误非常明显:list是bubble_sort(arr),str是" C° is "

你不能在bubble_sort(arr) + " C° is "连接它们，你需要将列表包装到str

---

最好的是使用print允许给定多个值的事实

print(bubble_sort(arr), "C° is", Fahrenheit, "F°")
print("High Temp:", max(temperature), "C°, Low Temp:",
min(temperature), "C° Average Temp:", avg, "C°")

---

现在，你没有排序任何东西因为arr中只有一个值，所以在循环之前只排序一次，然后显示华氏温度

arr = bubble_sort(temperature)
for value in arr:
fahrenheit = round(((value * 1.8) + 32), 1)
print(value, "C° is", fahrenheit, "F°")
avg = round(sum(temperature) / len(temperature), 1)
print("High Temp:", max(temperature), "C°, Low Temp:",
min(temperature), "C° Average Temp:", avg, "C°")

Answer 2

缺陷线

print(bubble_sort(arr) + " C° is " + str(Fahrenheit) + " F°" )

，因为你使用了"+"列表和字符串上的操作符为了修复它，尝试转换列表(调用"bubble_sort(arr)"到一个字符串)

这样的

print(''.join(str(e) for e in bubble_sort(arr)) + " C° is " + str(Fahrenheit) + " F°")