使用NetworkX时遇ImportError：无法导入greedy_modularity_communities

Hey there, let's work through this import error together! That ImportError: cannot import name 'greedy_modularity_communities' usually pops up due to NetworkX version differences or incorrect import paths. Here's how to fix it:

1. Check your NetworkX version first #

The greedy_modularity_communities function was introduced in NetworkX 2.0, so if you're running an older version (like 1.x), it won't exist at all. To check your version:

import networkx as nx
print(nx.__version__)

Or run this in your terminal:

pip show networkx

2. Use the correct import syntax (based on your version) #

For NetworkX 2.x and newer #

Your initial import should work, but if it's still throwing an error, try accessing the function through the community module directly instead of importing it standalone:

from networkx.algorithms import community

# Then call it like this
communities = community.greedy_modularity_communities(G)

For older NetworkX versions (pre-2.0) #

If you can't upgrade for some reason, note that this function didn't exist under that name. You'll either need to:

• Upgrade to a newer version (recommended, since older versions are no longer supported), or
• Use alternative community detection functions like community.modularity_max.greedy_modularity (though this is not ideal, as it's deprecated).

3. Upgrade NetworkX (most reliable fix) #

The easiest way to resolve this is to upgrade to the latest stable version of NetworkX. Run this in your terminal:

pip install --upgrade networkx

Quick note about directed graphs #

Since you're working with a directed graph, keep in mind that greedy_modularity_communities is designed for undirected graphs by default. To use it with your directed graph, convert it to an undirected version first:

undirected_G = G.to_undirected()
communities = community.greedy_modularity_communities(undirected_G)

内容的提问来源于stack exchange，提问作者Ayn