ความแตกต่างของกราฟตามช่วงเวลา

import networkx as nx  
# Instantiate a list of graphs that show edges added: added
added = []
# Instantiate a list of graphs that show edges removed: removed
removed = []
# Here's the fractional change over time
fractional_changes = []
window = 1

for i in range(len(Gs) - window):
    g1 = Gs[____]
    g2 = Gs[____ + ____]
        
    # Compute graph difference here
    added.append(____)   
    removed.append(____)
    
    # Compute change in graph size over time
    fractional_changes.append((len(g2.edges()) - len(g1.edges())) / len(g1.edges()))
    
# Print the fractional change
print(____)