NobodyXu

#!/usr/bin/env python3

import sys

# rowList is a list who the first and last element is 0(which will not be printed)
def print_pascal_triangle_row(row):
	print(" ".join([str(each) for each in row[1 : -1]]))

# @parm n denotes how many rows should it print
def print_pascal_triangle(n):

NobodyXu

• Semantics:
  • assignment:
    • When assigning a variable to another name, eg, a = b, a new object is created. However, no data is copied due to the [copy-on-modify][ref1]
  • In order to xor booleans, use xor(a, b).
  • reminder and quotient
    • %% for reminder and %/% for quotient.
  • For accessing list inside list, [[index]] must be used.
  • For returning a vector from a data.frame or data.table, df[[one_list_index]] must be used.
  • slicing:
• Slicing happens when you [] a container (vector, list, etc) using more than one index, generated by seq or : or c(). The index used can be integers or charaters.