PythoNyashka's questions

有一个文件db.json

其内容：

[
  {
    "user": "981"
  },
  {
    "user": "859"
  },
  {
    "user": "237"
  }
]

例如，您需要检查是否"user": "859"存在db.json

我该怎么做：

import json

def json_read(file_name):
    try:
        json_data = json.load(open(file_name, 'r', encoding="cp1251"))
    except:
        json_data = []
    return json_data

data = json_read("db.json")
user_in_db = "859"

for user in data:
    if user_in_db == user['user']:
        print("yes")
    else:
        print("No")

但我认为在大量用户的情况下，db.json这种方法不太方便。有没有更方便快捷的方法来做到这一点？

安装python3.7后没有调用pip

python3.7 -m pip3
/usr/local/bin/python3.7: No module named pip3

python3.7 -m pip
/usr/local/bin/python3.7: No module named pip

我下载点子

sudo wget https://bootstrap.pypa.io/get-pip.py

尝试安装

python3.7 get-pip.py

我收到一个错误

python3.7 get-pip.py
Traceback (most recent call last):
  File "get-pip.py", line 20890, in <module>
    main()
  File "get-pip.py", line 197, in main
    bootstrap(tmpdir=tmpdir)
  File "get-pip.py", line 82, in bootstrap
    import pip._internal
  File "/tmp/tmp_tcj3qgb/pip.zip/pip/_internal/__init__.py", line 40, in <module>
  File "/tmp/tmp_tcj3qgb/pip.zip/pip/_internal/cli/autocompletion.py", line 8, in <module>
  File "/tmp/tmp_tcj3qgb/pip.zip/pip/_internal/cli/main_parser.py", line 12, in <module>
  File "/tmp/tmp_tcj3qgb/pip.zip/pip/_internal/commands/__init__.py", line 6, in <module>
  File "/tmp/tmp_tcj3qgb/pip.zip/pip/_internal/commands/completion.py", line 6, in <module>
  File "/tmp/tmp_tcj3qgb/pip.zip/pip/_internal/cli/base_command.py", line 18, in <module>
  File "/tmp/tmp_tcj3qgb/pip.zip/pip/_internal/download.py", line 38, in <module>
  File "/tmp/tmp_tcj3qgb/pip.zip/pip/_internal/utils/glibc.py", line 3, in <module>
  File "/usr/local/lib/python3.7/ctypes/__init__.py", line 7, in <module>
    from _ctypes import Union, Structure, Array
ModuleNotFoundError: No module named '_ctypes'