如何确定Networkx中某些节点的位置？

import networkx as nx
import matplotlib.pyplot as plt

G = nx.Graph()
G.add_nodes_from([1, 2, 3, 4])

pos = {1: (0, 0), 2: (1, 1), 3: (2, 0), 4: (1, -1)}

nx.draw(G, pos=pos, with_labels=True)
plt.show()

import networkx as nx
import matplotlib.pyplot as plt

G = nx.Graph()
G.add_edges_from([(1, 2), (2, 3), (3, 4), (4, 1)])

pos = nx.spring_layout(G)  # 使用Spring布局算法确定节点位置

nx.draw(G, pos=pos, with_labels=True)
plt.show()

import networkx as nx
import matplotlib.pyplot as plt
from geopy.geocoders import Nominatim

geolocator = Nominatim(user_agent="my_app")

G = nx.Graph()
G.add_nodes_from(["New York", "London", "Paris"])

pos = {}

for node in G.nodes:
    location = geolocator.geocode(node)
    pos[node] = (location.longitude, location.latitude)

nx.draw(G, pos=pos, with_labels=True)
plt.show()