Question

如何遍历字典的所有键值对并使用python为同一键构建所有不同的值列表。

样本数据：

-- Running cmake version 3.2.2

-- MySQL 5.6.35

-- Packaging as: mysql-5.6.35-Linux-x86_64

-- HAVE_VISIBILITY_HIDDEN

-- ZSTD_INCLUDE_DIR /home/chinyajie/local/usr/local/include

-- ZSTD_LIBRARY /home/chinyajie/local/usr/local/lib/libzstd.so

-- ZSTD_INCLUDE_DIR /home/chinyajie/local/usr/local/include

-- ZSTD_LIBRARY /home/chinyajie/local/usr/local/lib/libzstd.so

test:PATH_TO_ZSTDZSTD_SYSTEM_LIBRARY

-- OPENSSL_INCLUDE_DIR = /usr/include

-- OPENSSL_LIBRARY = /usr/lib64/libssl.so

-- CRYPTO_LIBRARY = /usr/lib64/libcrypto.so

-- OPENSSL_MAJOR_VERSION = 1

-- SSL_LIBRARIES = /usr/lib64/libssl.so;/usr/lib64/libcrypto.so;dl

-- Using cmake version 3.2.2

-- Not building NDB
-- Library fbmysqlclient depends on OSLIBS -lpthread;/home/chinyajie/local/usr/local/lib/libzstd.so;m;rt;/usr/lib64/libssl.so;/usr/lib64/libcrypto.so;dl

-- Googletest was not found. gtest-based unit tests will be disabled. You can run cmake . -DENABLE_DOWNLOADS=1 to automatically download and build required components from source.

-- If you are inside a firewall, you may need to use an https proxy: export https_proxy=http://example.com:80

CMake Error in storage/rocksdb/CMakeLists.txt:

Cannot find source file:

../../rocksdb/usr/bin/make64
Tried extensions .c .C .c++ .cc .cpp .cxx .m .M .mm .h .hh .h++ .hm .hpp
.hxx .in .txx

CMake Error in storage/rocksdb/CMakeLists.txt:
Cannot find source file:

../../rocksdb/MAC=64
Tried extensions .c .C .c++ .cc .cpp .cxx .m .M .mm .h .hh .h++ .hm .hpp
.hxx .in .txx

CMake Error in storage/rocksdb/CMakeLists.txt:
Cannot find source file:

../../rocksdb/--makefile
Tried extensions .c .C .c++ .cc .cpp .cxx .m .M .mm .h .hh .h++ .hm .hpp
.hxx .in .txx

CMake Error in storage/rocksdb/CMakeLists.txt:
Cannot find source file:

../../rocksdb/tmp/tmp.QgIOMFCBRt
Tried extensions .c .C .c++ .cc .cpp .cxx .m .M .mm .h .hh .h++ .hm .hpp
.hxx .in .txx

-- Library mysqlserver depends on OSLIBS -lpthread;/home/chinyajie/local/usr/local/lib/libzstd.so;m;rt;/usr/lib64/libssl.so;/usr/lib64/libcrypto.so;dl;crypt;-lrt

-- CMAKE_BUILD_TYPE: RelWithDebInfo

-- COMPILE_DEFINITIONS: HAVE_CONFIG_H;ZSTD;HAVE_ZSTD_COMPRESS

-- CMAKE_C_FLAGS: -Wall -Wextra -Wformat-security -Wwrite-strings -std=c99

-- CMAKE_CXX_FLAGS: -Wall -Wextra -Wformat-security -Woverloaded-virtual -Wno-unused-parameter -std=c++11 -I /home/chinyajie/local/usr/local/include -I /home/chinyajie/local/usr/local/include

-- CMAKE_C_FLAGS_RELWITHDEBINFO: -O3 -g -fabi-version=2 -fno-omit-frame-pointer -fno-strict-aliasing -DDBUG_OFF

-- CMAKE_CXX_FLAGS_RELWITHDEBINFO: -O3 -g -fabi-version=2 -fno-omit-frame-pointer -fno-strict-aliasing -DDBUG_OFF

-- Configuring incomplete, errors occurred!

For

Cannot find source file:

../../rocksdb/MAC=64

对于上述列表，我需要构建一个列表，例如：

"list": [
    {
      "1": 1
    }, 
    {
      "1": 8
    }, 
    {
      "1": 9
    },
    {
      "1": 1
    }, 
    {
      "2": 8
    }, 
    {
      "2": 10
    }
  ],

Answer 1

这将为您提供想要的东西

import collections
input_ = {'list': [{'1': 1}, {'1': 8}, {'1': 9}, {'1': 1}, {'2': 8}, {'2': 10}]}
result = collections.defaultdict(list)

for elem in input_['list']:
    key, value = next(iter(elem.items()))  # best way to extract data from your strange format
    if value not in result[key]:
         result[key].append(value)

result = [dict(result)]  # put it in the strange format you want

输出

[{'1': [1, 8, 9], '2': [8, 10]}]

但是，我强烈建议您重新考虑如何构造数据。例如，您的输入应该是一个元组列表，而不是字典列表。

Answer 2

这应该可以解决问题-但请注意，仅使用一个键和一个值来制作字典并不是保存数据的方法。

new_dict = {}
for pair in your_list:
    for key in pair:
        if key in new_dict:
            new_dict[key] = new_dict[key].append(pair[key])
        else:
            new_dict[key] = [pair[key]]

print new_dict

new_dict是具有键->值列表映射

的字典

如何从python字典中的键值对获取同一键的所有值

2 个答案: