diff --git a/k4ever/api2/handlers.py b/k4ever/api2/handlers.py
index 49dc7d1..de5ac4b 100644
--- a/k4ever/api2/handlers.py
+++ b/k4ever/api2/handlers.py
@@ -59,7 +59,7 @@ class BuyableItemHandler(BaseHandler):
 				except Buyable.DoesNotExist:
 					return rc.NOT_FOUND
 			else:
-				if request.GET.has_key('type'):
+				if 'type' in request.GET:
 					obj = Buyable.objects.filter(buyableType__name=request.GET['type'])
 				return obj
 		try:
@@ -129,12 +129,12 @@ class BuyableItemHandler(BaseHandler):
 		if not request.content_type:
 			return getError(rc.BAD_REQUEST, "The content-type of the request must not be empty/urlencoded")
 		
-		if not request.data.has_key("items") and not request.data.has_key("deposits"):
+		if not "items" in request.data and not "deposits" in request.data:
 			return getError(rc.BAD_REQUEST, "You need to specify either items or deposits (or both).")
 		
-		if not request.data.has_key("items"):
+		if not "items" in request.data:
 			request.data['items'] = []
-		if not request.data.has_key("deposits"):
+		if not "deposits" in request.data:
 			request.data['deposits'] = []
 		
 		itemList = []
@@ -142,7 +142,7 @@ class BuyableItemHandler(BaseHandler):
 			if not isinstance(request.data['items'], Iterable):
 				raise TypeError()
 			itemList += request.data['items']
-			if request.data.has_key('items'):
+			if 'items' in request.data:
 				if not isinstance(request.data['deposits'], Iterable):
 					raise TypeError()
 			itemList += request.data['deposits']
@@ -157,7 +157,7 @@ class BuyableItemHandler(BaseHandler):
 		
 		ids = {}
 		for item in itemList:
-			if not ids.has_key(item):
+			if not item in ids:
 				try:
 					ids[item] = Buyable.objects.get(id=item)
 				except Buyable.DoesNotExist:
@@ -397,7 +397,7 @@ class AuthBlobHandler(BaseHandler):
 		"""
 		if not request.plugin.pluginCanWriteAuthblob:
 			return getError(rc.FORBIDDEN, "This plugin is not allowed to write the user's authblob")
-		if not request.data.has_key('authblob'):
+		if not 'authblob' in request.data:
 			return getError(rc.BAD_REQUEST, "To change the user's auth blob you actually need to provide one")
 		request.pluginperms.authblob = request.data['authblob']
 		request.pluginperms.authblob.save()
@@ -424,7 +424,7 @@ class AuthUserHandler(BaseHandler):
 		if not request.plugin.uniqueAuthblob:
 			return getError(rc.BAD_REQUEST, "This plugin does not support unique auth blobs, therefore we can't identify a user uniquely by their authblob")
 
-		if not request.GET.has_key('authblob') or request.GET['authblob'] == '':
+		if request.GET.get('authblob', '') == '':
 			return getError(rc.BAD_REQUEST, "Authblob was empty.")
 		
 		user = getUserFromAuthblob(request.GET['authblob'], request.plugin)
diff --git a/k4ever/main/views.py b/k4ever/main/views.py
index 67a20fa..3982303 100644
--- a/k4ever/main/views.py
+++ b/k4ever/main/views.py
@@ -138,7 +138,7 @@ def pluginAuthblob(request, pluginId):
 		return render_to_response("settings/settings.html", d, RequestContext(request))
 	
 	# has the user write access to the authblob?
-	if not p.plugin.userCanWriteAuthblob or not request.POST.has_key("authblob"):
+	if not p.plugin.userCanWriteAuthblob or not "authblob" in request.POST:
 		d = getPluginDict(request)
 		d['pluginerror'] = "Der Authblob darf für dieses Plugin nicht vom User verändert werden (oder der Authblob war kaputt)"
 		return render_to_response("settings/settings.html", d, RequestContext(request))
diff --git a/k4ever/transaction/forms.py b/k4ever/transaction/forms.py
index 087e451..4bb3a96 100644
--- a/k4ever/transaction/forms.py
+++ b/k4ever/transaction/forms.py
@@ -25,7 +25,7 @@ class TransactionForm(forms.ModelForm):
 	def clean(self):
 		# needed to enforce TransactionTypes needsCheck "default value"
 		cleaned_data = super(TransactionForm, self).clean()
-		if cleaned_data.has_key("transactionType"):
+		if "transactionType" in cleaned_data:
 			self.instance.checked = not cleaned_data['transactionType'].needsCheck
 		return cleaned_data
 
diff --git a/k4ever/transaction/views.py b/k4ever/transaction/views.py
index b233753..544d3c5 100644
--- a/k4ever/transaction/views.py
+++ b/k4ever/transaction/views.py
@@ -27,7 +27,7 @@ def overview(request):
 	vform = VirtualTransactionForm()
 	state = None
 	payway = "payin"
-	if request.method == 'POST' and request.POST.has_key('_formtype'):
+	if request.method == 'POST' and '_formtype' in request.POST:
 		if request.POST['_formtype'] == "normal":
 			transaction = Transaction(user=request.user)
 			form = TransactionForm(request.POST, instance=transaction)