Return to Answer

http://api.stackoverflow.com/1.1/users/string_id returns

{
 "error": {
 "code": 404,
 "message": "The server has not found anything matching the Request-URI."
 }
}

and will raise KeyErrors here:

def getUserDisplayName( self, userId ):
 return self.getUserInfo( userId )['users'][0]['display_name']
def getUserViewCount( self, userId ):
 return self.getUserInfo( userId )['users'][0]['view_count']
def getUserReputation( self, userId ):
 return self.getUserInfo( userId )['users'][0]['reputation']

http://api.stackoverflow.com/1.1/users/9924 returns

{
 "total": 0,
 "page": 1,
 "pagesize": 30,
 "users": []
}

and will raise IndexErrors here:

def getUserDisplayName( self, userId ):
 return self.getUserInfo( userId )['users'][0]['display_name']
def getUserViewCount( self, userId ):
 return self.getUserInfo( userId )['users'][0]['view_count']
def getUserReputation( self, userId ):
 return self.getUserInfo( userId )['users'][0]['reputation']

And since you are using userId as an argument to every method, and the StackOverflowFetcher instance is used only for 1 userId – it might me a good idea to add __init__ method:

__init__(self, userId):
 # some userId validation
 self.userId = userId

and save yourself a bit of passing userId around.

http://api.stackoverflow.com/1.1/users/string_id returns

{
 "error": {
 "code": 404,
 "message": "The server has not found anything matching the Request-URI."
 }
}

and will raise KeyErrors here:

def getUserDisplayName( self, userId ):
 return self.getUserInfo( userId )['users'][0]['display_name']
def getUserViewCount( self, userId ):
 return self.getUserInfo( userId )['users'][0]['view_count']
def getUserReputation( self, userId ):
 return self.getUserInfo( userId )['users'][0]['reputation']

http://api.stackoverflow.com/1.1/users/9924 returns

{
 "total": 0,
 "page": 1,
 "pagesize": 30,
 "users": []
}

and will raise IndexErrors here:

def getUserDisplayName( self, userId ):
 return self.getUserInfo( userId )['users'][0]['display_name']
def getUserViewCount( self, userId ):
 return self.getUserInfo( userId )['users'][0]['view_count']
def getUserReputation( self, userId ):
 return self.getUserInfo( userId )['users'][0]['reputation']

And since you are using userId as an argument to every method, and the StackOverflowFetcher instance is used only for 1 userId – it might me a good idea to add __init__ method:

__init__(self, userId):
 # some userId validation
 self.userId = userId

and save yourself a bit of passing userId around.

UPD:

If all options are set to True, this will call getUserInfo and, therefore, query api 3 times:

if ( show_display_name ) : print fetcher.getUserDisplayName( userId )
if ( show_view_count) : print fetcher.getUserViewCount( userId )
if ( show_reputation ) : print fetcher.getUserReputation( userId )

Since you call it at least once any way, you better call it in the __init__(), or just store retrieved value in an instance attribute and use it like this:

def __init__(self, userId):
 #...
 self.userInfo = None
def getUserReputation(self):
 if self.userInfo is None:
 self.userInfo = self.getUserInfo()
 return self.userInfo['users'][0]['reputation']