Question

如何将列表列表转换为单个列表？

输入：

a=[['AA'], ['AE'], ['AH'], ['AO'],]

期望的输出：

['AA','AE','AH','AO']

Answer 1

source 'https://rubygems.org'


# Bundle edge Rails instead: gem 'rails', github: 'rails/rails'
gem 'rails', '4.2.6'
# Use sqlite3 as the database for Active Record
gem 'sqlite3'
# Use SCSS for stylesheets
gem 'sass-rails', '~> 5.0'
# Use Uglifier as compressor for JavaScript assets
gem 'uglifier', '>= 1.3.0'
# Use CoffeeScript for .coffee assets and views
gem 'coffee-rails', '~> 4.1.0'
# See https://github.com/rails/execjs#readme for more supported   runtimes
# gem 'therubyracer', platforms: :ruby

# Use jquery as the JavaScript library
gem 'jquery-rails'
# Turbolinks makes following links in your web application faster. Read more: https://github.com/rails/turbolinks
gem 'turbolinks'
# Build JSON APIs with ease. Read more:     https://github.com/rails/jbuilder
gem 'jbuilder', '~> 2.0'
# bundle exec rake doc:rails generates the API under doc/api.
gem 'sdoc', '~> 0.4.0', group: :doc

# Use ActiveModel has_secure_password
# gem 'bcrypt', '~> 3.1.7'

# Use Unicorn as the app server
 # gem 'unicorn'

# Use Capistrano for deployment
# gem 'capistrano-rails', group: :development
gem 'angularjs-rails'

group :development, :test do
# Call 'byebug' anywhere in the code to stop execution and get a   debugger console
gem 'byebug'
end

group :development do
# Access an IRB console on exception pages or by using <%= console %> in    views
gem 'web-console', '~> 2.0'

# Spring speeds up development by keeping your application running in the background. Read more: https://github.com/rails/spring
gem 'spring'

Answer 2

你可以使用理解列表：

或使用map和lambda functions

a=[['AA'], ['AE'], ['AH'], ['AO'],]
# open the item [0] with generators
Newa = [x[0] for x in a]
>>>['AA', 'AE', 'AH', 'AO']

参见示例：http://www.secnetix.de/olli/Python/list_comprehensions.hawk

Answer 3

编辑：

for i, value in enumerate(a):
    a[i] = value[0]

如何将包含多个列表的python列表转换为单个列表？

3 个答案: