flip_dict: Flip keys and values in a dictionary.uniques_only: Get unique items from an iterable while maintaining item ordermoviestats: Utilities for asking questions of a JSON-based data fileduplicates_only: Refactor duplicate-checking function to improve performance ...
unique() #获取Series中的唯一值数组 print(uniques) uniques.sort() #对Series数组进行排序 print(uniques) #计算Series数组各值出现的频率 print(frame_g.value_counts()) #obj各值是否包含于["b","c"]中mask = frame_g.isin(["b","c"]) print(mask) print(frame_g[mask]) #选取Series中数据的...
现在让我们将每个序列乘以 2: In [10]: %timeit my_arr2 = my_arr *2309us +-7.48us per loop (mean +- std. dev. of7runs,1000loops each) In [11]: %timeit my_list2 = [x *2forxinmy_list]46.4ms +-526us per loop (mean +- std. dev. of7runs,10loops each) 基于NumPy 的算法通...
file_looper: Utility to open many files one after the other uniques_only: Get unique items from an iterable while maintaining item order Month: Class representing a month and year PhoneNumber: Class representing a US phone number float_range: range-like utility for floating point numbers A...
#-*- encoding:utf-8 -*- import numpy as np import os import pandas as pd from pandas import Series,DataFrame import matplotlib.pyplot as plt obj = Series(['a','a','b','f','e']) uniques = obj.unique() uniques.sort() #记住这是就地排序 #print uniques #下面进行计数统计,注意得到...
from itertools import chain import time import random # Dry run. x = [[random.choice(range(10000)) for i in range(10)] for j in range(10)] list(set().union(*x)) list(set(chain(*x))) y_time = 0 z_time = 0 for _ in range(1000): ...
问密码生成器性能: Python (Google应用程序脚本)EN我认为代码可能会更容易一些。我没有深入研究你的代码...
6 小时 Python 入门 以下操作均在 Windows 环境下进行操作,先说明一下哈 一、安装 Python 1、官网下载 Python 进入官网(https://www.python.org),点击 Downloads,选择要下载的版本: 2、安装 Python 安装时注意下图勾选部分一定要勾...
In [102]: simple = pd.get_dummies(df, prefix="new_prefix") In [103]: simple Out[103]: C new_prefix_a new_prefix_b new_prefix_b new_prefix_c 0 1 1 0 0 1 1 2 0 1 0 1 2 3 1 0 1 0 In [104]: from_list = pd.get_dummies(df, prefix=["from_A", "from_B"]) ...
True is not strict, but will prefer to parsewith day first (this is a known bug, based on dateutil behavior).yearfirst : bool, default FalseSpecify a date parse order if `arg` is str or its list-likes.- If True parses dates with the year first, eg 10/11/12 is parsed as2010-...