list values being rewritten when dictionary values are not reseted inside for-loop

Question

Something strange is happening to my code that I do not understand. I have the following lines:

#informe.py
import csv
from pprint import pprint
def leer_camion(nombre_archivo):
    diccionario = {}
    camion = []

    with open(nombre_archivo, 'rt') as f:
        rows = csv.reader(f)
        headers = next(rows)
        for row in rows:
            diccionario['nombre'] = row[0]
            diccionario['cajones'] = int(row[1])
            diccionario['precio'] = float(row[2]) 
            camion.append(diccionario)
            pprint(camion)
            #diccionario = {}
        return camion


 lista = leer_camion('../Data/camion.csv')

My problem is that if I don't reset the dictionary at the end of the for, the list is formed as follows:

[{'cajones': 100, 'nombre': 'Lima', 'precio': 32.2}]
[{'cajones': 50, 'nombre': 'Naranja', 'precio': 91.1},
 {'cajones': 50, 'nombre': 'Naranja', 'precio': 91.1}]
[{'cajones': 150, 'nombre': 'Caqui', 'precio': 103.44},
 {'cajones': 150, 'nombre': 'Caqui', 'precio': 103.44},
 {'cajones': 150, 'nombre': 'Caqui', 'precio': 103.44}]
...

In other words, the dictionary values are rewritten both in the dictionary and in camion, if I don't misinterpret. And the final list carries the values from the last column of the csv file. On the other hand, if I uncomment the dictionary = {} line, that is, if I reset the dictionary at the end of the loop, the list is correctly formed:

[{'cajones': 100, 'nombre': 'Lima', 'precio': 32.2}]
[{'cajones': 100, 'nombre': 'Lima', 'precio': 32.2},
 {'cajones': 50, 'nombre': 'Naranja', 'precio': 91.1}]
[{'cajones': 100, 'nombre': 'Lima', 'precio': 32.2},
 {'cajones': 50, 'nombre': 'Naranja', 'precio': 91.1},
 {'cajones': 150, 'nombre': 'Caqui', 'precio': 103.44}]
...

Why does this happen? Thanks a lot!