DSM questions

DSM answers

• How to maintain a strict alternating pattern of item "types" in a list?
• matrix of sparse complex numbers in Julia
• Calculate dataframe mean by skipping certain values in Python / Pandas
• Why is this datetime string not converting to a datetime object in a Pandas dataframe?
• What does the def line do in python [closed]
• How to iterate over urlparse.urlsplit() result Python
• zero values of an array to be converted to nan values
• Delete columns of a matrix that are mostly zero
• Python equivalent of Ruby's #find_index with lambda?
• SciPy module names and functions fail to be defined