Common Python Mistakes
# WRONG - trying to index with a list
x_list[[0,2]]
# error: "list indices must be integers or slices, not list"
- Solution: use numpy or pandas for advanced indexing
# Tuple Immutability
x_tuple[0] = 10
# error: "'tuple' object does not support item assignment"
Common R Mistakes
which.max with ties:
- returns only FIRST index with max value
- for all ties, use
which(x == max(x))
useful thing about factors:
- converting to factor BEFORE summary() gives frequency table
- without factor: gives 5 number summary
Python Stuff
:LiLightbulb: enumerate() Usage:
for idx, (key, val) in enumerate(dict.items()):
print(f"{idx+1}. The gender of {key} is {val}")
{x:2d} : pad integer to 2 characters{x**2:2d} : evaluate expression, then format{x:0.2f} : float with 2 decimal places