预期缩进块异常

Question

在运行这段代码之后，我得到了这个异常，但我没有找到任何正确修复它的地方

import networkx as nx
from networkx.algorithms import bipartite
import numpy as np
from pandas import DataFrame, concat
import pandas as pd
import matplotlib.pyplot as plt
from scipy.optimize import curve_fit 
import ast
import csv
import sys

def plot_degree_dist(G):
in_degrees = G.in_degree()
in_degrees=dict(in_degrees)
in_values = sorted(set(in_degrees.values()))
in_hist = [in_degrees.values().count(x) for x in in_values]
plt.figure() 
plt.grid(True)
plt.loglog(in_values, in_hist, 'ro-') 
plt.plot(out_values, out_hist, 'bv-') 
plt.legend(['In-degree', 'Out-degree'])
plt.xlabel('Degree')
plt.ylabel('Number of nodes')
plt.title('network of places in Cambridge')
#plt.xlim([0, 2*10**2])

我希望收到正确的图表，但我得到的只是这个警告

  File "<ipython-input-32-f89b896484d7>", line 2
    in_degrees = G.in_degree()
             ^
IndentationError: expected an indented block

Answer 1

Python 依靠适当的缩进来识别功能块。此代码应该有效：

import networkx as nx
from networkx.algorithms import bipartite
import numpy as np
from pandas import DataFrame, concat
import pandas as pd
import matplotlib.pyplot as plt
from scipy.optimize import curve_fit 
import ast
import csv
import sys

def plot_degree_dist(G):
    in_degrees = G.in_degree()
    in_degrees=dict(in_degrees)
    in_values = sorted(set(in_degrees.values()))
    in_hist = [in_degrees.values().count(x) for x in in_values]
    plt.figure() 
    plt.grid(True)
    plt.loglog(in_values, in_hist, 'ro-') 
    plt.plot(out_values, out_hist, 'bv-') 
    plt.legend(['In-degree', 'Out-degree'])
    plt.xlabel('Degree')
    plt.ylabel('Number of nodes')
    plt.title('network of places in Cambridge')
    #plt.xlim([0, 2*10**2])

基本上只需根据您的样式要求将其缩进 2 或 4 个空格即可。

预期缩进块异常

Expected an indented block Exception

csv

graph

jupyter-notebook

pyhook