Why is there a difference between these?:
# Python
f = open("./text.txt", "r")
for i in f.readlines():
for l in i:
print(print(l == "\n", ":", l))
f.close()
# -----------------------------
# Julia
f = open("./text.txt", "r")
while !eof(f)
for l in readline(file)
println(l == '\n', " : ", l)
end
end
close(f)
The Python one outputs this:
False : h
False : e
False : l
False : l
False : o
False :
False : W
False : o
False : r
False : l
False : d
True :
<--- yep, it is as expected
False : y
False : a
False : y
The Julia one outputs this:
false : h
false : e
false : l
false : l
false : o
false : <--- is this not a \n??
false : W
false : o
false : r
false : l
false : d
false : y
false : a
false : y
text.txt is this:
hello World
yay
As you can see the outputs are different. How can I make the Julia one behaves like the Python one? Are there other ways of reading a file in Julia?
if you like to read a character at a time you should use readeach, e.g.
f = open("./text.txt", "r")
for l in readeach(f, Char)
println(l == '\n', " : ", l)
end
false : h
false : e
false : l
false : l
false : o
false :
false : w
false : o
false : r
false : l
false : d
true :
false : y
false : a
false : y
BTW, just note that this is not an efficient way.
You can do this:
# Julia
f = open("./text.txt", "r")
while !eof(f)
for l in readline(file, keep=true)
println(l == '\n', " : ", l)
end
end
close(f)
By default, it discards \n's, but you can keep them by adding keep=true.
Here is a more Julian (and corrected) version using the keep=true suggestion by user17558100:
open("./text.txt", "r") do f
for l in readlines(f, keep=true)
foreach(c->println(c == '\n', " : ",c), l)
end
end
This do format is the same as Python's with statement and this makes sure the file is closed without an explicit close() call.