Question

我想将数据分组到我的列“Count”和另一列“State”中。我想输出一个列表列表，每个子集列表只是每个州的计数。

示例输出：[[120,200]，[40,20,40]，...]

120和200将是让我们说州加利福尼亚州的计数

我尝试了以下内容：

df_new = df[['State']].groupby(['Count']).to_list()

我得到一个keyerror：'count'

回溯：

Traceback (most recent call last):
  File "C:\Users\Michael\workspace\UCIIntrotoPythonDA\src\Michael_Madani_week3.py", line 84, in <module>
    getStateCountsDF(filepath)
  File "C:\Users\Michael\workspace\UCIIntrotoPythonDA\src\Michael_Madani_week3.py", line 81, in getStateCountsDF
    df_new = df[['State']].groupby(['Count']).to_list() 
  File "C:\Users\Michael\Anaconda\lib\site-packages\pandas\core\generic.py", line 3159, in groupby
    sort=sort, group_keys=group_keys, squeeze=squeeze)
  File "C:\Users\Michael\Anaconda\lib\site-packages\pandas\core\groupby.py", line 1199, in groupby
    return klass(obj, by, **kwds)
  File "C:\Users\Michael\Anaconda\lib\site-packages\pandas\core\groupby.py", line 388, in __init__
    level=level, sort=sort)
  File "C:\Users\Michael\Anaconda\lib\site-packages\pandas\core\groupby.py", line 2148, in _get_grouper
    in_axis, name, gpr = True, gpr, obj[gpr]
  File "C:\Users\Michael\Anaconda\lib\site-packages\pandas\core\frame.py", line 1797, in __getitem__
    return self._getitem_column(key)
  File "C:\Users\Michael\Anaconda\lib\site-packages\pandas\core\frame.py", line 1804, in _getitem_column
    return self._get_item_cache(key)
  File "C:\Users\Michael\Anaconda\lib\site-packages\pandas\core\generic.py", line 1084, in _get_item_cache
    values = self._data.get(item)
  File "C:\Users\Michael\Anaconda\lib\site-packages\pandas\core\internals.py", line 2851, in get
    loc = self.items.get_loc(item)
  File "C:\Users\Michael\Anaconda\lib\site-packages\pandas\core\index.py", line 1572, in get_loc
    return self._engine.get_loc(_values_from_object(key))
  File "pandas\index.pyx", line 134, in pandas.index.IndexEngine.get_loc (pandas\index.c:3824)
  File "pandas\index.pyx", line 154, in pandas.index.IndexEngine.get_loc (pandas\index.c:3704)
  File "pandas\hashtable.pyx", line 686, in pandas.hashtable.PyObjectHashTable.get_item (pandas\hashtable.c:12280)
  File "pandas\hashtable.pyx", line 694, in pandas.hashtable.PyObjectHashTable.get_item (pandas\hashtable.c:12231)
KeyError: 'Count'

我觉得这应该是一行简单的代码，我在这里做错了什么？

Answer 1

这可以作为一个单行：

import UIKit
import Parse

class ViewController: UIViewController {

    @IBOutlet var passwordTextField: UITextField!

    @IBOutlet var emailTextField: UITextField!

    //@IBOutlet var messageLabel: UILabel!


    @IBAction func loginVerifyButton(sender: AnyObject) {

        var pwdEntered = passwordTextField.text

        var emlEntered = emailTextField.text

        if pwdEntered != "" && emlEntered != "" {

            // If not empty then yay, do something

            func userSignUp() {

                var user = PFUser()
                user.email = emlEntered
                user.password = pwdEntered
                user.signUpInBackgroundWithBlock {
                    (succeeded: Bool, error: NSError?) -> Void in
                    if let error = error {
                        let errorString = error.userInfo?["error"] as? NSString
                        // Show the errorString somewhere and let the user try again.

                    } else {
                        // Hooray! Let them use the app now.
                    }
                }

            }

        }else {

            //self.messageLabel.text = "All Fields Required"

        }

您应该阅读groupby的文档，了解分组的预期结果以及如何更改（http://pandas.pydata.org/pandas-docs/stable/groupby.html）。

在熊猫中分组

1 个答案: