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Assign pandas dataframe column dtypes
...e types explicitly with pandas DataFrame.astype(dtype, copy=True, raise_on_error=True, **kwargs) and pass in a dictionary with the dtypes you want to dtype
here's an example:
import pandas as pd
wheel_number = 5
car_name = 'jeep'
minutes_spent = 4.5
# set the columns
data_columns = ['wheel_number...
Which regular expression operator means 'Don't' match this character?
*, ?, + characters all mean match this character. Which character means 'don't' match this? Examples would help.
4 Answers...
Xcode stuck on Indexing
...at I accidentally defined a class as its own subclass. I got no warning or error for this but the compiling got stuck.
class mainClass : mainClass
{
...
}
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What HTTP status response code should I use if the request is missing a required parameter?
...was unable to process the contained
instructions. For example, this error condition may occur if an XML
request body contains well-formed (i.e., syntactically correct), but
semantically erroneous, XML instructions.
They state that malformed xml is an example of bad syntax (calli...
How to check if there exists a process with a given pid in Python?
...
Sending signal 0 to a pid will raise an OSError exception if the pid is not running, and do nothing otherwise.
import os
def check_pid(pid):
""" Check For the existence of a unix pid. """
try:
os.kill(pid, 0)
except OSError:
retu...
pretty-print JSON using JavaScript
...
This worked for me, but threw an error using JSON.parse so I modified it to be JSON.stringify(jsonString, null, 2). Depends on your JSON/Object.
– Jazzy
Aug 2 '14 at 22:20
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How to automatically start a service when running a docker container?
...at like tail -F
CMD service mysql start && tail -F /var/log/mysql/error.log
This is often preferred when you have a single service running as it makes the outputted log accessible to docker.
Or use foreground command to do this
CMD /usr/bin/mysqld_safe
This works only if there is ...
How are multi-dimensional arrays formatted in memory?
In C, I know I can dynamically allocate a two-dimensional array on the heap using the following code:
6 Answers
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Maximum single-sell profit
...e we are given an array of n integers representing stock prices on a single day. We want to find a pair (buyDay, sellDay) , with buyDay ≤ sellDay , such that if we bought the stock on buyDay and sold it on sellDay , we would maximize our profit.
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Writing a list to a file with Python
...hon 2 use 'r' instead of 'rb' when reading the pickle if you get the "ValueError: insecure string pickle"
– queise
Sep 17 '18 at 15:34
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