CODEWITHSUNDEEP
pythonmatplotlibtypeerror
P. Prunesquallor
P. Prunesquallor

Reputation: 571

matplotlib read data from url: TypeError: a bytes-like object is required, not 'str'

I'm trying to follow the 'Earthquakes' example from this tutorial. The code is as follows: 

import urllib
from mpl_toolkits.basemap import Basemap

# Significant earthquakes in the last 30 days
url = urllib.request.urlopen("https://earthquake.usgs.gov/earthquakes/feed/v1.0/summary/4.5_month.csv")

# Reading and storage of data
data = url.read()
data = data.split(b'\n')[+1:-1]

E = np.zeros(len(data), dtype=[('position',  float, 2),
                               ('magnitude', float, 1)])

for i in range(len(data)):
    row = data[i].split(',')
    E['position'][i] = float(row[2]),float(row[1])
    E['magnitude'][i] = float(row[4])

I get the following error: 

---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
<ipython-input-66-eed77a8fb64a> in <module>()
     16 
     17 for i in range(len(data)):
---> 18     row = data[i].split(',')
     19     E['position'][i] = float(row[2]),float(row[1])
     20     E['magnitude'][i] = float(row[4])

TypeError: a bytes-like object is required, not 'str'

I googled similar questions and as far as I understand, it has to do with using Python 3.+ instead of 2.7, but I couldn't figure out how to adjust the code for it to work. Sorry if the question is dumb, I don't understand what I need to do.

I tried with the following but to no avail: 

if sys.version_info[0] == 3:
    from urllib.request import urlopen
else:
    from urllib import urlopen

with urlopen(url) as url:
    data = url.read()

Upvotes: 1

Views: 160

Answers (1)

norok2
norok2

Reputation: 26916

When you try to use split you are using ',' instead of b','. The point is that bytes and str need to be explicitly converted into each other using encode or decode, or you have to be consistently using one or the other.

Upvotes: 2

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