lilele12211104的专栏

conda -Vconda infoconda list --revisionsconda install geopandasconda uninstall protobufconda config --show default_channelsconda config --show channelsconda config --set channel_priority flexibleconda config --set report_errors falseconda .

python中defaultdict用法详解认识defaultdict：当我使用普通的字典时，用法一般是dict={},添加元素的只需要dict[element] =value即，调用的时候也是如此，dict[element] = xxx,但前提是element字典里，如果不在字典里就会报错，如：1.png这时defaultdict就能排上用场了，defaultdict的作用是在于，当字典...

判断字符串相等使用==，不使用is和cmp()函数cmp() 函数则是相当于 <,==,> 但是在 Python3 中，cmp() 函数被移除了，所以我以后还是避免少用这个函数。#-*-conding:utf-8-*-i='新闻';m=input();if i==m: print('yes');else: print('no'); input(); if se...

#!/usr/bin/env python3# Copyright 2014 Brett Slatkin, Pearson Education Inc.## Licensed under the Apache License, Version 2.0 (the "License");# you may not use this file except in compliance with...

import loggingfrom pprint import pprintfrom sys import stdout as STDOUT# Example 1def index_words(text): result = [] if text: result.append(0) for index, letter in enumerate...

# Example 7def divide(a, b): try: return a / b except ZeroDivisionError as e: raise ValueError('Invalid inputs') from e# Example 8x, y = 5, 2try: result = divide(x, y...

Use try/except/else/finally when you want to do it all in one compound statement.The try/finally compound statement lets you run cleanup code regardless of whether exceptions were raised in the try...

flavor_list = ['vaneee','cee','ww','we']for i,flavor in enumerate (flavor_list): print('%d: %s' % (i+1, flavor))You can make this even shorter by specifying the number from which enumerate should...

No Generatorvalue = [len(x) for x in open('/tmp/my_file.txt')]print(value)Using Generator by () charactersit = (len(x) for x in open('/tmp/my_file.txt'))print(next(it))print(next(it))Generat...

a = [1,2,3,4]even_sqaures = [x**2 for x in a if x%2 ==0 ]

Item 5 Know How to Slice SequencesThe result of slicing a list is a whole new list. References to the objects from the original list are maintained.Modifying the result of slicing won’t affect the o...