Library

 

Standard Library

https://docs.python.org/3/library/

defaultdict 예제

s = "abcdadbcaad"

d = {}
for c in s:
    if c not in d:
        d[c] = 0
    else:
        d[c] += 1
print(d)  # {'a': 4, 'b': 2, 'c': 2, 'd': 3}

d = {}
for c in s:
    d.setdefault(c, 0)
    d[c] += 1
print(d)  # {'a': 4, 'b': 2, 'c': 2, 'd': 3}

####################################################################
from collections import defaultdict

d = defaultdict(int)
for c in s:
    d[c] += 1
print(d)  # defaultdict(<class 'int'>, {'a': 4, 'b': 2, 'c': 2, 'd': 3})

####################################################################
d = {}
for c in s:
    d[c] = d.get(c, 0) + 1
print(d)

####################################################################
import collections
import sys

# 참조하는 라이브러리 path 확인
print(sys.path)

# 설치된 경로 확인
print(collections.__file__)

 

Third-party Library

Intellij 의 경우 Project Structure 설정에서 추가할 수 있음