I have a binary file that contains a column of values. Using Python 3, I'm trying to unpack the data into an array or list.
file = open('data_ch04.dat', 'rb')
values = struct.unpack('f', file.read(4))[0]
print(values)
file.close()
The above code prints only one value to the console:
-1.1134038740480121e-29
How can I get all of the values from the binary file?
Here's a link to the binary file on Dropbox:
https://www.dropbox.com/s/l69rhlrr9u0p4cq/data_ch04.dat?dl=0
Your code only displays one float because it only reads four bytes.
Try this:
import struct
# Read all of the data
with open('data_ch04.dat', 'rb') as input_file:
data = input_file.read()
# Convert to list of floats
format = '{:d}f'.format(len(data)//4)
data = struct.unpack(format, data)
# Display some of the data
print len(data), "entries"
print data[0], data[1], data[2], "..."
>f or little-endian <f is used to unpack the data. Is it possible to tell which approach is correct for this type of file?