Read Data From Stdin
Input from stdin.
# python3
import sys
# data is a string
data = sys.stdin.read()
# now, data is a list of string
data = data.split()
# press ctrl+D after you complete the input
Input from stdin.
# python2
n_tables, n_queries = map(int, input().split())
counts = list(map(int, input().split()))
Read Data in Bash Shell
$ python3 main.py < tests/test.txt
Create a List of Numbers
n = 10
# initial all the values of an array to the same number
# but don't use this way in two dimensional array
# use numpy instead, for two dimensional array.
l1 = [1] * n
# [1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
# initial an array as a sequence of numbers
l2 = list(range(n))
# [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
Floor of a Number(下取整)
# what is floor
Floor(2.4) = 2
Floor(2.8) = 2
Floor(2) = 2
Floor(3) = 3
# floor in python
3 // 2 = 1
4 // 2 = 2
Swap the Value of Tow Variables
a = 1
b = 2
a, b = b, a
# result
# a = 2
# b = 1
Line Break(The Line of Code is Too Long)
a = 1 + 1
# same as
a = 1 + \
1
a = dostuff(blahblah1, blahblah2, blahblah3, blahblah4, blahblah5,
blahblah6, blahblah7)
if a == True and \
b == False
a = '1' + '2' + '3' + \
'4' + '5'
a = ('1' + '2' + '3' +
'4' + '5')
Quick Debug
# add one line
import pdb; pdb.set_trace()
# then the program will be stop at this line.
# you can use these commands:
# n : next
# l : peek the code
# s : step into a function
# p : print some variable
# b n : set a breakpoint
# display : monitor some variable when they are changed
# q : quit the debug mode