Take latest apk if not version specified

If no *versionCode* parameter is specified to *download* or *delivery*
methods, fetch the latest one with a simple `self.details(pkgName)`

gpapi/googleplay.py

@@ -491,7 +491,7 @@ def _deliver_data(self, url, cookies, progress_bar):
         bar.done()
         return response_content
 
-    def delivery(self, packageName, versionCode, offerType=1,
+    def delivery(self, packageName, versionCode=None, offerType=1,
                  downloadToken=None, progress_bar=False, expansion_files=False):
         """Download an already purchased app.
 
@@ -513,6 +513,11 @@ def delivery(self, packageName, versionCode, offerType=1,
             Data to build this name string is provided in the dict object. For more
             info check https://developer.android.com/google/play/expansion-files.html
         """
+
+        if versionCode is None:
+            # pick up latest version
+            versionCode = self.details(packageName)['versionCode']
+
         path = "delivery"
         params = {'ot': str(offerType),
                   'doc': packageName,
@@ -557,7 +562,7 @@ def delivery(self, packageName, versionCode, offerType=1,
                 result['additionalData'].append(a)
             return result
 
-    def download(self, packageName, versionCode, offerType=1,
+    def download(self, packageName, versionCode=None, offerType=1,
                  progress_bar=False, expansion_files=False):
         """Download an app and return its raw data (APK file). Free apps need
         to be "purchased" first, in order to retrieve the download cookie.
@@ -578,6 +583,10 @@ def download(self, packageName, versionCode, offerType=1,
         if self.authSubToken is None:
             raise Exception("You need to login before executing any request")
 
+        if versionCode is None:
+            # pick up latest version
+            versionCode = self.details(packageName)['versionCode']
+
         path = "purchase"
         headers = self.getDefaultHeaders()
         params = {

test.py

@@ -35,10 +35,9 @@
 
 # DOWNLOAD
 docid = apps[0]['docId']
-version = apps[0]['versionCode']
 print('\nTelegram docid is: %s\n' % docid)
 print('\nAttempting to download %s\n' % docid)
-fl = server.download(docid, version, progress_bar=True)
+fl = server.download(docid, None, progress_bar=True)
 with open(docid + '.apk', 'wb') as f:
     f.write(fl['data'])
     print('\nDownload successful\n')