You can create a path relative to a module by using a module’s __file__ attribute. For example: myfile = open(os.path.join( os.path.dirname(__file__), MY_FILE)) This should do what you want regardless of where you start your script.
For UNIX based systems (Linux, Mac): Hello, you can type : Ctrld Ctrld closes the standard input (stdin) by sending EOF. Example : >>> import sys >>> message = sys.stdin.readlines() Hello World My Name Is James Bond # <ctrl-d> EOF sent >>> print message [‘Hello\n’, ‘World\n’, ‘My\n’, ‘Name\n’, ‘Is\n’, ‘James\n’, ‘Bond\n’] For Windows : To … Read more
UPDATE: see the EDIT below. I would use: import os os.environ[‘LD_LIBRARY_PATH’] = os.getcwd() # or whatever path you want This sets the LD_LIBRARY_PATH environment variable for the duration/lifetime of the execution of the current process only. EDIT: it looks like this needs to be set before starting Python: Changing LD_LIBRARY_PATH at runtime for ctypes So … Read more
as a literal answer to the question ‘Python Import from parent directory‘: to import ‘mymodule’ that is in the parent directory of your current module: import os parentdir = os.path.dirname(os.path.dirname(os.path.abspath(__file__))) os.sys.path.insert(0,parentdir) import mymodule edit Unfortunately, the __file__ attribute is not always set. A more secure way to get the parentdir is through the inspect module: … Read more
You can use array.nbytes for numpy arrays, for example: >>> import numpy as np >>> from sys import getsizeof >>> a = [0] * 1024 >>> b = np.array(a) >>> getsizeof(a) 8264 >>> b.nbytes 8192
Python’s standard out is buffered (meaning that it collects some of the data “written” to standard out before it writes it to the terminal). Calling sys.stdout.flush() forces it to “flush” the buffer, meaning that it will write everything in the buffer to the terminal, even if normally it would wait before doing so. Here’s some … Read more
From the Python 3 documentation: sys.intern(string) Enter string in the table of “interned” strings and return the interned string – which is string itself or a copy. Interning strings is useful to gain a little performance on dictionary lookup – if the keys in a dictionary are interned, and the lookup key is interned, the … Read more
For future visitors: Python 3.4 contextlib provides for this directly (see Python contextlib help) via the redirect_stdout context manager: from contextlib import redirect_stdout import io f = io.StringIO() with redirect_stdout(f): help(pow) s = f.getvalue()
Python really tries hard to intelligently set sys.path. How it is set can get really complicated. The following guide is a watered-down, somewhat-incomplete, somewhat-wrong, but hopefully-useful guide for the rank-and-file python programmer of what happens when python figures out what to use as the initial values of sys.path, sys.executable, sys.exec_prefix, and sys.prefix on a normal … Read more
As per the documentation: This allows you to switch from the default ASCII to other encodings such as UTF-8, which the Python runtime will use whenever it has to decode a string buffer to unicode. This function is only available at Python start-up time, when Python scans the environment. It has to be called in … Read more