WoW API: GetNumPartyMembers

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Returns number of party members.

partyMembers = GetNumPartyMembers()

Returns

partyMembers: Number - The number of party members, excluding the player (0 to 4).

The snippet below adds a message stating the number of people in the player's current party to the default chat frame.

print("There are " .. GetNumPartyMembers() .. " other people in your party.");

While in a battleground, this function returns information about your battleground party. You may retrieve information about your non-battleground party using GetRealNumPartyMembers().
While in a raid, you are also in a party. You might be the only person in your raidparty, so this function could still return 0.