LouisLan的学习简记 👋🏼

Question 22 Question: Write a program to compute the frequency of the words from the input. The output should output after sorting the key alphanumerically. Suppose the following input is supplied to the program: New to Python or choosing between Python 2 and Python 3? Read Python 2 or Python 3. Then, the output should be: 2:2 3.:1 3?:1 New:1 Python:5 Read:1 and:1 between:1 choosing:1 or:2 to:1 Hints In case of input data being supplied to the question, it should be assumed to be a con....

Question 20 Question: Define a class with a generator which can iterate the numbers, which are divisible by 7, between a given range 0 and n. Suppose the following input is supplied to the program: 7 Then, the output should be: 0 7 14 Hints: Consider use class, function and comprehension. Main author's Solution: Python 2 The solution code for this problem was not as reltive to as the problem mentioned and there was a typing mistake while calling the function. Solution: Python 3 '''S....

Question 18 Question: A website requires the users to input username and password to register. Write a program to check the validity of password input by users. Following are the criteria for checking the password: At least 1 letter between [a-z] At least 1 number between [0-9] At least 1 letter between [A-Z] At least 1 character from [$#@] Minimum length of transaction password: 6 Maximum length of transaction password: 12 Your program should accept a sequence of comma separated password....

Question 16 Question: Use a list comprehension to square each odd number in a list. The list is input by a sequence of comma-separated numbers. >Suppose the following input is supplied to the program: 1,2,3,4,5,6,7,8,9 Then, the output should be: 1,9,25,49,81 Hints: In case of input data being supplied to the question, it should be assumed to be a console input. Main author's Solution: Python 2 ## The solution by the author is incorrect.Thus it's not included here. My Solution: Py....

Question 14 Question: Write a program that accepts a sentence and calculate the number of upper case letters and lower case letters. Suppose the following input is supplied to the program: Hello world! Then, the output should be: UPPER CASE 1 LOWER CASE 9 Hints: In case of input data being supplied to the question, it should be assumed to be a console input. Main author's Solution: Python 2 s = raw_input() d = {"UPPER CASE":0, "LOWER CASE":0} for c in s: if c.isupper(): d["UPPER CASE....

Question 10 Question Write a program that accepts a sequence of whitespace separated words as input and prints the words after removing all duplicate words and sorting them alphanumerically. Suppose the following input is supplied to the program: hello world and practice makes perfect and hello world again Then, the output should be: again and hello makes perfect practice world Hints: In case of input data being supplied to the question, it should be assumed to be a console input.We us....

Question 4 Question: Write a program which accepts a sequence of comma-separated numbers from console and generate a list and a tuple which contains every number.Suppose the following input is supplied to the program: 34,67,55,33,12,98 Then, the output should be: ['34', '67', '55', '33', '12', '98'] ('34', '67', '55', '33', '12', '98') Hints: In case of input data being supplied to the question, it should be assumed to be a console input.tuple() method can convert list to tuple Main aut....

Question 1 Question: Write a program which will find all such numbers which are divisible by 7 but are not a multiple of 5, between 2000 and 3200 (both included).The numbers obtained should be printed in a comma-separated sequence on a single line. Hints: Consider use range(#begin, #end) method. Main author's Solution: Python 2 l=[] for i in range(2000, 3201): if (i%7==0) and (i%5!=0): l.append(str(i)) print ','.join(l) My Solution: Python 3 Using for loops for i in range(2000,3201): i....

Break The Ice With Python A journey of 100+ simple yet interesting problems which are explained, solved, discussed in different pythonic ways Introduction The exercise text contents of this repository was collected from GitHub account of zhiwehu. I collected it to practice and solve all the listed problems with python. Even after these collected problems are all set up, I will try to add more problems in near future. If you are a very beginner with python then I hope this 100+ exercise will hel....

本文是斯坦福大学CS229机器学习课程的基础材料，原始文件下载 CS229 机器学习课程复习材料-概率论 概率论复习和参考 概率论是对不确定性的研究。通过这门课，我们将依靠概率论中的概念来推导机器学习算法。这篇笔记试图涵盖适用于CS229的概率论基础。概率论的数学理论非常复杂，并且涉及到“分析”的一个分支：测度论。在这篇笔记中，我们提供了概率的一些基本处理方法，但是不会涉及到这些更复杂的细节。 1. 概率的基本要素 为了定义集合上的概率，我们需要一些基本元素， 样本空间$\Omega $：随机实验的所有结果的集合。在这里，每个结果 $w \in \Omega $ 可以被认为是实验结束时现实世界状态的完整描述。 事件集（事件空间）$\mathcal{F}$：元素 $A \in \mathcal{F}$ 的集合（称为事件）是 $\Omega $ 的子集（即每个 $A \subseteq \Omega$ 是一个实验可能结果的集合）。 备注：$\mathcal{F}$需要满足以下三个条件： (1) $\emptyset \in \mathcal{F}$ (2) $A \in \mat....