How to fix TypeError: ‘int’ object is not subscriptable
When you type x = 0 that is creating a new int variable (name) and assigning a zero to it. When you type x[age1] that is trying to access the age1‘th entry, as if x were an array.
python-2.7
Calling Python script from C++ and using its output
Here is a solution to embed the execution of your python module from within your C++ application. It’s not better or worst than forking/executing your python script through a system call, it just is a different way to do it. Whether it is best or not depend on your context and usage. Some time ago … Read more
WinError 2 The system cannot find the file specified (Python)
Popen expect a list of strings for non-shell calls and a string for shell calls. Call subprocess.Popen with shell=True: process = subprocess.Popen(command, stdout=tempFile, shell=True) Hopefully this solves your issue. This issue is listed here: https://bugs.python.org/issue17023
sum each value in a list of tuples
Use zip() and sum(): In [1]: l = [(1, 2), (3, 4), (5, 6), (7, 8), (9, 0)] In [2]: [sum(x) for x in zip(*l)] Out[2]: [25, 20] or: In [4]: map(sum, zip(*l)) Out[4]: [25, 20] timeit results: In [16]: l = [(1, 2), (3, 4), (5, 6), (7, 8), (9, 0)]*1000 In [17]: %timeit … Read more
Implement packing/unpacking in an object
You can unpack any Iterable. This means you need to implement the __iter__ method, and return an iterator. In your case, this could simply be: def __iter__(self): return iter((self.name, self.age, self.gender)) Alternatively you could make your class an Iterator, then __iter__ would return self and you’d need to implement __next__; this is more work, and … Read more
How to modify the default font in Tkinter?
Tkinter has several built-in fonts — TkDefaultFont, TkTextFont, TkFixedFont, etc. These are all what are called “named fonts”. They are remarkably powerful — change one of these and all widgets that use them will change as well. To change one of these fonts, get a handle to it and then use the configure method to … Read more
Parse a Pandas column to Datetime when importing table from SQL database and filtering rows by date
Pandas is aware of the object datetime but when you use some of the import functions it is taken as a string. So what you need to do is make sure the column is set as the datetime type not as a string. Then you can make your query. df[‘date’] = pd.to_datetime(df[‘date’]) df_masked = df[(df[‘date’] … Read more
Avoid Twitter API limitation with Tweepy
For anyone who stumbles upon this on Google, tweepy 3.2+ has additional parameters for the tweepy.api class, in particular: wait_on_rate_limit – Whether or not to automatically wait for rate limits to replenish wait_on_rate_limit_notify – Whether or not to print a notification when Tweepy is waiting for rate limits to replenish Setting these flags to True … Read more
How to handle IncompleteRead: in python
The link you included in your question is simply a wrapper that executes urllib’s read() function, which catches any incomplete read exceptions for you. If you don’t want to implement this entire patch, you could always just throw in a try/catch loop where you read your links. For example: try: page = urllib2.urlopen(urls).read() except httplib.IncompleteRead, … Read more
How to read the last line of a file in Python? [duplicate]
A simple solution, which doesn’t require storing the entire file in memory (e.g with file.readlines() or an equivalent construct): with open(‘filename.txt’) as f: for line in f: pass last_line = line For large files it would be more efficient to seek to the end of the file, and move backwards to find a newline, e.g.: … Read more