这个问题在这里已经有答案：

How can I read inputs as numbers?(10个答案)
22天前关门了。
所以当我运行这个程序时，它运行得很好，直到它到达变量‘t’的输入。当我输入0.75作为输入时，它给出一个错误。然而，如果我去掉输入函数，只把t=0.75，程序就能完美地工作。为什么会发生这种情况，我如何修复它？

import matplotlib.pyplot as plt
import numpy as np

file = plt.imread(input('Enter file name: '))   #Read in image
countSnow = 0            #Number of pixels that are almost white
t = input("Enter threshold: ")                 #Threshold for almost white-- can adjust between 0.0 and 1.0

# For every pixel:

for i in range(file.shape[0]):
     for j in range(file.shape[1]):
          #Check if red, green, and blue are > t:
          if (file[i,j,0] > t) and (file[i,j,1] > t) and (file[i,j,2] > t):
               countSnow = countSnow + 1

print("Number of white pixels:", countSnow)