我想要做的是根據用戶放置程序的數字打開文件夾、瀏覽器或由字典關閉，其中每個數字都有一個功能。問題是它在所有情況下都返回 none 而不是 return 或函數。輸入 0 時應關閉程序。輸入 1 時，應打開 windows 7 的默認 .mp3。輸入 2 時，您應該只打開默認音樂文件夾。輸入 3 時，只需在屏幕上輸入“三”。最后通過輸入 666 使用我輸入的 URL 打開 google chrome。如果輸入另一個號碼，應留下“無效號碼” import webbrowser import subprocess import sys opened = True def one(): print("Opening explorer.exe") #subprocess.Popen(r'explorer /select,"C:\Users\reciclo"') subprocess.call("explorer C:\\Users\\Public\\Music\\Sample Music\Kalimba.mp3", shell=True) return "opened" def zero(): print("Exit the program") opened = False return "Exit" def two(): subprocess.call("explorer C:\\Users\\Public\\Music\\Sample Music", shell=True) return "two" def three(): return "three" def demon(): demon_url = 'https://piv.pivpiv.dk/' chrome_path = 'C:/Program Files (x86)/Google/Chrome/Application/chrome.exe %s' webbrowser.get(chrome_path).open(demon_url) return "invoked" def switch_demo(var): switcher = { 0: zero, 1: one, 2: two, 3: three, 666: demon, } var = switcher.get(var, "Invalid num") while opened: if opened == True: var = int(input("enter a number between 1 and 9999999999 ")) print(switch_demo(var))) elif opened== False: print("Goout") sys.exit()
3 回答
守候你守候我
TA貢獻1802條經驗 獲得超10個贊
您忘記從 中返回值switch_demo()，請檢查以下代碼：
def switch_demo(var):
switcher = {
0: zero,
1: one,
2: two,
3: three,
666: demon,
}
return switcher.get(var, "Invalid num")
while opened:
if opened == True:
var = int(input("enter a number between 1 and 9999999999 "))
print(switch_demo(var)))
elif opened== False:
print("Goout")
sys.exit()
皈依舞
TA貢獻1851條經驗 獲得超3個贊
您必須從switch_demo 另外返回一個函數，更改print(switch_demo(var)))為print(switch_demo(var)()). 可以這樣重寫以更有意義：
var = "something"
function = switch_demo(var)
print(function())
如果這是您想要的，這實際上會調用function并打印出它返回的任何內容。
不負相思意
TA貢獻1777條經驗 獲得超10個贊
字典值作為要調用的函數：
切換器[0] ()
def switch_demo(var):
switcher = {
0: zero,
1: one,
2: two,
3: three,
666: demon,
}
#var = switcher.get(var, "Invalid num")
switcher[int(var)]() # exec function
-
def switch_demo(var):
switcher = {
0: zero,
1: one,
2: two,
3: three,
666: demon,
}
#var = switcher.get(var, "Invalid num")
return (switcher[int(var)]())
while opened:
if opened == True:
var = int(input("enter a number between 1 and 9999999999 "))
print (switch_demo(var))
elif opened == False:
print("Goout")
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