Problems with "Class Meta" and " __str__"

[Elmaco7]

Hello, I do these models but the Django admin page doesn't read the "class 
Meta" and " __str__".
This is the models.py document





























*from django.db import models# Create your models here.class 
Autore(models.Model):nome = models.CharField(max_length=50)cognome 
= models.CharField(max_length=50)def __str__(self):return 
self.autore_textclass Meta:verbose_name_plural = "Autori"class 
Genere(models.Model):descrizione = models.CharField(max_length=30)def 
__str__(self):return self.genere_textclass Meta:
verbose_name_plural = "Generi"class Libro(models.Model):titolo = 
models.CharField(max_length=200)autore = models.ForeignKey(Autore, 
on_delete=models.CASCADE)genere = models.ForeignKey(Genere, 
on_delete=models.CASCADE)def __str__(self):return 
self.libro_textclass Meta:verbose_name_plural = "Libri"*


These are the results




Can someone help me?

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Postgre sql problem

[Elmaco7]

*Hello, I'm trying to use Postresql with my django project, but when i try 
to install psycopg2(with this command 'pip3 install psycopg2')  this 
problem appears:*

Collecting psycopg2
  Using cached 
https://files.pythonhosted.org/packages/5c/1c/6997288da181277a0c29bc39a5f9143ff20b8c99f2a7d059cfb55163e165/psycopg2-2.8.3.tar.gz
Building wheels for collected packages: psycopg2
  Building wheel for psycopg2 (setup.py) ... error
  ERROR: Command errored out with exit status 1:
   command: /home/user/myproject/myprojectenv/bin/python3 -u -c 'import 
sys, setuptools, tokenize; sys.argv[0] = 
'"'"'/tmp/pip-install-t391_oat/psycopg2/setup.py'"'"'; 
__file__='"'"'/tmp/pip-install-t391_oat/psycopg2/setup.py'"'"';f=getattr(tokenize,
 
'"'"'open'"'"', open)(__file__);code=f.read().replace('"'"'\r\n'"'"', 
'"'"'\n'"'"');f.close();exec(compile(code, __file__, '"'"'exec'"'"'))' 
bdist_wheel -d /tmp/pip-wheel-mkc6kj2i --python-tag cp36
   cwd: /tmp/pip-install-t391_oat/psycopg2/
  Complete output (40 lines):
  running bdist_wheel
  running build
  running build_py
  creating build
  creating build/lib.linux-x86_64-3.6
  creating build/lib.linux-x86_64-3.6/psycopg2
  copying lib/pool.py -> build/lib.linux-x86_64-3.6/psycopg2
  copying lib/_range.py -> build/lib.linux-x86_64-3.6/psycopg2
  copying lib/_lru_cache.py -> build/lib.linux-x86_64-3.6/psycopg2
  copying lib/sql.py -> build/lib.linux-x86_64-3.6/psycopg2
  copying lib/extensions.py -> build/lib.linux-x86_64-3.6/psycopg2
  copying lib/_ipaddress.py -> build/lib.linux-x86_64-3.6/psycopg2
  copying lib/errorcodes.py -> build/lib.linux-x86_64-3.6/psycopg2
  copying lib/tz.py -> build/lib.linux-x86_64-3.6/psycopg2
  copying lib/extras.py -> build/lib.linux-x86_64-3.6/psycopg2
  copying lib/_json.py -> build/lib.linux-x86_64-3.6/psycopg2
  copying lib/errors.py -> build/lib.linux-x86_64-3.6/psycopg2
  copying lib/compat.py -> build/lib.linux-x86_64-3.6/psycopg2
  copying lib/__init__.py -> build/lib.linux-x86_64-3.6/psycopg2
  running build_ext
  building 'psycopg2._psycopg' extension
  creating build/temp.linux-x86_64-3.6
  creating build/temp.linux-x86_64-3.6/psycopg
  x86_64-linux-gnu-gcc -pthread -DNDEBUG -g -fwrapv -O2 -Wall -g 
-fstack-protector-strong -Wformat -Werror=format-security -Wdate-time 
-D_FORTIFY_SOURCE=2 -fPIC -DPSYCOPG_VERSION=2.8.3 (dt dec pq3 ext lo64) 
-DPG_VERSION_NUM=100010 -DHAVE_LO64=1 -I/usr/include/python3.6m 
-I/home/user/myproject/myprojectenv/include/python3.6m -I. 
-I/usr/include/postgresql -I/usr/include/postgresql/10/server -c 
psycopg/psycopgmodule.c -o 
build/temp.linux-x86_64-3.6/psycopg/psycopgmodule.o 
-Wdeclaration-after-statement
  In file included from psycopg/psycopgmodule.c:27:0:
  ./psycopg/psycopg.h:34:10: fatal error: Python.h: No such file or 
directory
   #include 
^~
  compilation terminated.
  
  It appears you are missing some prerequisite to build the package from 
source.
  
  You may install a binary package by installing 'psycopg2-binary' from 
PyPI.
  If you want to install psycopg2 from source, please install the packages
  required for the build and try again.
  
  For further information please check the 'doc/src/install.rst' file (also 
at
  ).
  
  error: command 'x86_64-linux-gnu-gcc' failed with exit status 1
  
  ERROR: Failed building wheel for psycopg2
  Running setup.py clean for psycopg2
Failed to build psycopg2
Installing collected packages: psycopg2
  Running setup.py install for psycopg2 ... error
ERROR: Command errored out with exit status 1:
 command: /home/user/myproject/myprojectenv/bin/python3 -u -c 'import 
sys, setuptools, tokenize; sys.argv[0] = 
'"'"'/tmp/pip-install-t391_oat/psycopg2/setup.py'"'"'; 
__file__='"'"'/tmp/pip-install-t391_oat/psycopg2/setup.py'"'"';f=getattr(tokenize,
 
'"'"'open'"'"', open)(__file__);code=f.read().replace('"'"'\r\n'"'"', 
'"'"'\n'"'"');f.close();exec(compile(code, __file__, '"'"'exec'"'"'))' 
install --record /tmp/pip-record-bl1kkv0m/install-record.txt 
--single-version-externally-managed --compile --install-headers 
/home/user/myproject/myprojectenv/include/site/python3.6/psycopg2
 cwd: /tmp/pip-install-t391_oat/psycopg2/
Complete output (40 lines):
running install
running build
running build_py
creating build
creating build/lib.linux-x86_64-3.6
creating build/lib.linux-x86_64-3.6/psycopg2
copying lib/pool.py -> build/lib.linux-x86_64-3.6/psycopg2
copying lib/_range.py -> build/lib.linux-x86_64-3.6/psycopg2
copying lib/_lru_cache.py -> build/lib.linux-x86_64-3.6/psycopg2
copying lib/sql.py -> build/lib.linux-x86_64-3.6/psycopg2
copying lib/extensions.py -> build/lib.linux-x86_64-3.6/psycopg2
copying lib/_ipaddress.py -> build/lib.linux-x86_64-3.6/psycopg2
copying lib/errorcodes.py -> build/lib.linux-x86_64-3.6/psycopg2
copying lib/tz.py -> build/lib.linux-x86_64-3.6/psycopg2
  

Help with Django

[Elmaco7]

Hello, I'm new and it's the first time that I use Django.
I should create a site with a database containing Students, exams and 
grades.
Furthermore I should give the possibility to insert a student and to know 
how many exams he has given and also to insert an exam and know which 
students have passed it.
Can someone help me?
Thanks.

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