Replacement for open() in python.
Reading text files with data in C++ is surprisingly easy:
int main() {
ifstream myfile;
myfile.open("data.txt");
int records << myfile;
double* array = new double[records];
for (int i = 0; i < records; i++) {
array[i] << myfile;
}
}
In Python, you'd have to read each line, split on words, cast to integer... yeah, forget it. OpenSesame makes this easy:
from open_sesame import OpenSesame
myfile = OpenSesame("data.txt")
records = myfile.int()
for i in range(0, records):
array.append(myfile.number())
On my 5 year old CPU, the initial working version immediately ran at reading 130 000 words per second. I thought that should be good enough for anyone who wouldn't write a custom one anyway.
To see for yourself, run test.py.
If it needs to be faster, let me know what code you're using, what your data size is, and I'll happily improve it. I like optimizing, as long as someone has a use for it :)
Mainly, you'd use the following functions:
from open_sesame import OpenSesame
f = OpenSesame('/path/to/file') # no other arguments needed. Opens as read-only.
i = f.int() # get an int
num = f.number() # get a float/double/arbitrarily large number (this is python!)
word = f.word() # read the next word (until a newline or whitespace character)
ten_raw_bytes = f.bytes(10) # reads 10 bytes.
line = f.line() # Reads until \r\n, \n or \r (in that order of preference).
f.close() # Close the read handle
Aliases exist, so you don't have to remember which name I chose:
f.readline() # instead of .line()
f.string() # instead of .word()
f.num() # instead of .number()
f.float() # instead of .number()
f.double() # instead of .number()
f.integer() # instead of .int()
f.read(length) # instead of .bytes(length)
f.raw(length) # instead of .bytes(length)