python - 从文本文件返回 bool 值

Question

尝试编写多个脚本来访问一个文本文件，以从该文本文件中检索其切换值，然后返回 false 值并将其更改为 true，反之亦然。

值总是返回为 false，不确定我缺少什么，但这是文本文件:

1
False
3
True
5
6
7
8
9

这是源代码:

def append():
  with open('values', 'r') as file:
      # read a list of lines into data
      data = file.readlines()
  # now change the line
  re_value = value

  data[1] = re_value+"\n"
  # and write everything back
  with open('values', 'w') as file:
      file.writelines(data)
  print("value changed to "+re_value)

def read() -> bool:
  #opens the value file to find the value of the toggle
  f=open("values", "r")

  for x, line in enumerate(f):
      if x == 1:
          toggle = line
          print(toggle)
          return toggle
  f.close()


toggle = read()

if toggle:
    print("Light is on turn it off")
    #runs command to turn off the light
    #runs command to change value for light
    value = "False"
    append()
else:
    print("Light is off turn it on")
    #runs command to turn on the light
    #runs command to change value for light
    value = "True"
    append()

Answer 1

似乎您用来评估条件的 boolean 值是一个字符串。

在这种情况下，您可以将其保留为字符串:

if value == "True":
    print "Condition is true!"

或者实现类似的东西:

def str2bool(v):
  return v.lower() in ("true",) # you can add to the tuple other values that you consider as true if useful

print str2bool(value)