如何打印函數內部的變量

Question

我的代碼如下。 試圖在函數內打印htmlStr 。 有什么辦法

import urllib.request
import re
url = 'http://dummy.restapiexample.com/api/v1/employees'
def testhtml(self):
    response = urllib.request.urlopen(url)
    htmlStr = response.read().decode('ISO-8859-1')
    with open("html.csv","a+") as file:
        file.write(htmlStr)
    pdata = re.findall(r'"employee_name":"(\'?\w+)"', htmlStr)
    return pdata

print(htmlStr) 我做的函數外拋出錯誤

當我print (htmlStr)出現錯誤NameError: name 'htmlStr' is not defined

Answer 1

您收到錯誤是因為您試圖訪問其域之外的局部變量。

這是您的代碼中的樣子：

# 1. Begin creating your function
def testhtml(self):
    # 2. This is a local environment. 
    #    Any variables created here will not be accessible outside of the function
    response = urllib.request.urlopen(url)
    # 3. The local variable `htmlStr` is created.
    htmlStr = response.read().decode('ISO-8859-1')
    with open("html.csv","a+") as file:
        # 4. Your local variable `htmlStr` is accessed.
        file.write(htmlStr)
    pdata = re.findall(r'"employee_name":"(\'?\w+)"', htmlStr)
    return pdata

# 5. Your function is now complete. The local variable `htmlStr` is no longer accessible.

那有意義嗎？ 如果你想打印你的函數（在調試時），你可以在函數中放置一個打印語句。 （只需確保最終將其刪除以防止雜亂無章的控制台讀數。）如果您需要訪問函數外部的變量，請考慮將其包含在輸出中。