Welkom bij de cursus!

Introductie tot data importeren in Python

Hugo Bowne-Anderson

Data Scientist at DataCamp

Data importeren

Flat files, bijv. .txt, .csv
Bestanden uit andere software

ch_1_1_v2.004.png

Data importeren

Flat files, bijv. .txt, .csv
Bestanden uit andere software
Relationele databases

ch_1_1_v2.005.png

Platte tekstbestanden

ch_1_1_v2.007.png

Tabelgegevens

titanic.csv

                        Name      Sex  Cabin  Survived
     Braund, Mr. Owen Harris     male    NaN         0
  Cumings, Mrs. John Bradley   female    C85         1
      Heikkinen, Miss. Laina   female    NaN         1
Futrelle, Mrs. Jacques Heath   female   C123         1
    Allen, Mr. William Henry     male    NaN         0

¹ Bron: Kaggle

Tabelgegevens

titanic.csv

titanic.csv met een gemarkeerde rij

Tabelgegevens

titanic.csv

titanic.csv met een gemarkeerde kolom

Flat file

Een tekstbestand lezen

filename = 'huck_finn.txt'

file = open(filename, mode='r')  # 'r' is to read

text = file.read()

file.close()

Een tekstbestand printen

print(text)

YOU don't know about me without you have read a book by
the name of The Adventures of Tom Sawyer; but that 
ain't no matter. That book was made by Mr. Mark Twain,
and he told the truth, mainly. There was things which 
he stretched, but mainly he told the truth.  That is 
nothing. never seen anybody but lied one time or 
another, without it was Aunt Polly, or the widow, or 
maybe Mary. Aunt Polly--Tom's Aunt Polly, she is--and
Mary, and the Widow Douglas is all told about in that
book, which is mostly a true book, with some 
stretchers, as I said before.

Naar een bestand schrijven

filename = 'huck_finn.txt'
file = open(filename, mode='w')  # 'w' is to write
file.close()

Contextmanager met with

with open('huck_finn.txt', 'r') as file:
    print(file.read())

YOU don't know about me without you have read a book by
the name of The Adventures of Tom Sawyer; but that 
ain't no matter. That book was made by Mr. Mark Twain,
and he told the truth, mainly. There was things which 
he stretched, but mainly he told the truth.  That is 
nothing. never seen anybody but lied one time or 
another, without it was Aunt Polly, or the widow, or 
maybe Mary. Aunt Polly--Tom's Aunt Polly, she is--and 
Mary, and the Widow Douglas is all told about in that 
book, which is mostly a true book, with some 
stretchers, as I said before.

In de oefeningen ga je:

Bestanden naar de console printen
Specifieke regels printen
Flat files bespreken

Laten we oefenen!

Introductie tot data importeren in Python