request.POST.get（'sth'）vs request.POST ['sth'] - 区别？ [英] request.POST.get('sth') vs request.POST['sth'] - difference?

问题描述

  request.POST.get（'sth'）
  

和

  request.POST [ 'sth'] 
  

没有找到类似的问题，两者对我来说都是一样的，假设我可以单独使用它们，但也许我错了，这就是为什么我问。任何想法？

解决方案

request.POST ['sth'] will如果'sth'不在 request.POST KeyError $ c>。

request.POST.get（'sth'）将返回没有如果'sth'不在 request.POST 。

此外， .get 允许您提供默认值的附加参数，如果该键不在字典中，则返回该参数。例如， request.POST.get（'sth'，'mydefaultvalue'）

这是任何python字典，并不是特定于 request.POST 。

---

这两个片段在功能上是一样的：

第一个片段：

  try：
x = request.POST ['sth'] 
除了KeyError：
x =无
  

第二个片段： / p>

  x = request.POST.get（'sth'）
  

---

这两个片段在功能上是一样的：

第一个片段：

  try ：
x = request.POST ['sth'] 
除了KeyError：
x = -1 
  

第二个片段：

  x = request.POST.get（ST h'，-1）
  

这两个片段在功能上是相同的：

第一个片段：

 如果请求中有'sth'.POST：
x = request.POST ['sth'] 
 else：
x = -1 
  

第二个片段：

  x = request.POST.get（'sth'，-1）
  

What is the difference between

request.POST.get('sth')

and

request.POST['sth']

Did not find the similar question, both work the same for me, suppose I can use them separately but maybe I am wrong, that is why I am asking. Any ideas?

解决方案

request.POST['sth'] will raise a KeyError exception if 'sth' is not in request.POST.

request.POST.get('sth') will return None if 'sth' is not in request.POST.

Additionally, .get allows you to provide an additional parameter of a default value which is returned if the key is not in the dictionary. For example, request.POST.get('sth', 'mydefaultvalue')

This is the behavior of any python dictionary and is not specific to request.POST.

---

These two snippets are functionally identical:

First snippet:

try:
    x = request.POST['sth']
except KeyError:
    x = None

Second snippet:

x = request.POST.get('sth')

---

These two snippets are functionally identical:

First snippet:

try:
    x = request.POST['sth']
except KeyError:
    x = -1

Second snippet:

x = request.POST.get('sth', -1)

---

These two snippets are functionally identical:

First snippet:

if 'sth' in request.POST:
    x = request.POST['sth']
else:
    x = -1

Second snippet:

x = request.POST.get('sth', -1)

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