Python 如何使函数在条件下使用默认参数

在这段代码中，如果用户决定使用默认值并单击enter，我想让函数使用默认参数，这会导致输入为空字符串

然而，就我而言；它只是使用空字符串作为参数运行代码

arc = ArcGIS()

def mapMaker(country, zoom = 4, location = "~/Desktop/", name = "Untitled"):
    loc = arc.geocode(country)
    countryLat = loc.latitude
    countryLon = loc.longitude
    map = folium.Map(location=[countryLat, countryLon], zoom_start=zoom, min_zoom=2)
    map.save("%s.html" % location + name)

mapZoom = input("Choose Your Map's Starting Zoom:(Default = 4) ")
mapLoc = input("Choose Where Your Map File Will Be Created:(Default = ~/Desktop) ")
mapName = input("Choose Your Map's Name:(Default = Untitled) ")
mapMaker(userin, zoom = mapZoom, location = mapLoc, name = mapName )

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PS：我知道以前也有人问过类似的问题，但我无法使用此代码，因为此函数有更多的参数。

我会使用字典而不是参数来处理此问题，这样，您可以在运行时将参数设置为默认值。它看起来是这样的：

arc = ArcGIS()

def mapMaker(country, zoom = 4, location = "~/Desktop/", name = "Untitled"):
    loc = arc.geocode(country)
    countryLat = loc.latitude
    countryLon = loc.longitude
    map = folium.Map(location=[countryLat, countryLon], zoom_start=zoom, min_zoom=2)
    map.save("%s.html" % location + name)

mapZoom = input("Choose Your Map's Starting Zoom:(Default = 4) ")
mapLoc = input("Choose Where Your Map File Will Be Created:(Default = ~/Desktop) ")
mapName = input("Choose Your Map's Name:(Default = Untitled) ")
mapMaker(userin, zoom = mapZoom, location = mapLoc, name = mapName )

def mapMaker(myDict):
    #access the arguments via mydict['your_argument']


myDict = {}
myDict['mapZoom'] = int(input("Choose Your Map's Starting Zoom:(Default = 4) ") or 4)})
myDict['mapLoc'] = str(input("Choose Where Your Map File Will Be Created:(Default = ~/Desktop) ") or '~/Desktop')
myDict['mapName'] = str(input("Choose Your Map's Name:(Default = Untitled) ") or 'Untitled')
mapMaker(myDict)

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这回答了你的问题吗？对最后，我能够让代码正常工作。