[Pandas, Numpy 01] 객체생성

#pip install numpy
#pip install pandas

# pandas, numpy IMPORT
import numpy as np
import pandas as pd

# Series 객체 생성
s = pd.Series([1,3,5, np.nan, 6,8])
print(s)

# DataFrame 객체 생성
dates = pd.date_range("20210629", periods=6)
print(dates)

#인덱스 및 라벨
df = pd.DataFrame(np.random.randn(6,4), index=dates, columns=list("ABCD"))
print(df)

#dict 타입
df2 = pd.DataFrame(
    {
        "A": 1.0,
        "B": pd.Timestamp("20210629"),
        "C": pd.Series(1, index=list(range(4)), dtype="float32"),
        "D": np.array([3] * 4, dtype="int32"),
        "E": pd.Categorical(["test", "train", "test", "train"]),
        "F": "foo",
    }
)
print(df2)
print(df2.dtypes)