FM / methods

/usr/local/lib64/python3.6/site-packages/pandas/tests/frame/methods/

/usr/local/lib64/python3.6/site-packages/pandas/tests/frame/methods

Name	Size	Mode	Actions
__pycache__/	-	0755	rm
test_align.py	10339	0644	edit dl rm
test_append.py	7399	0644	edit dl rm
test_asfreq.py	1970	0644	edit dl rm
test_asof.py	5767	0644	edit dl rm
test_assign.py	2982	0644	edit dl rm
test_astype.py	21027	0644	edit dl rm
test_at_time.py	3205	0644	edit dl rm
test_between_time.py	3675	0644	edit dl rm
test_clip.py	6028	0644	edit dl rm
test_combine.py	1359	0644	edit dl rm
test_combine_first.py	12748	0644	edit dl rm
test_compare.py	6158	0644	edit dl rm
test_count.py	1068	0644	edit dl rm
test_cov_corr.py	11888	0644	edit dl rm
test_describe.py	12492	0644	edit dl rm
test_diff.py	7374	0644	edit dl rm
test_drop.py	15662	0644	edit dl rm
test_droplevel.py	855	0644	edit dl rm
test_drop_duplicates.py	13387	0644	edit dl rm
test_duplicated.py	3191	0644	edit dl rm
test_explode.py	5294	0644	edit dl rm
test_filter.py	4933	0644	edit dl rm
test_first_and_last.py	1803	0644	edit dl rm
test_head_tail.py	1194	0644	edit dl rm
test_interpolate.py	11816	0644	edit dl rm
test_isin.py	7324	0644	edit dl rm
test_nlargest.py	6731	0644	edit dl rm
test_pct_change.py	3436	0644	edit dl rm
test_pop.py	1226	0644	edit dl rm
test_quantile.py	18028	0644	edit dl rm
test_rank.py	11377	0644	edit dl rm
test_reindex_like.py	1187	0644	edit dl rm
test_rename.py	12543	0644	edit dl rm
test_rename_axis.py	4074	0644	edit dl rm
test_replace.py	59230	0644	edit dl rm
test_reset_index.py	12506	0644	edit dl rm
test_round.py	7916	0644	edit dl rm
test_select_dtypes.py	12104	0644	edit dl rm
test_set_index.py	19571	0644	edit dl rm
test_shift.py	10324	0644	edit dl rm
test_sort_index.py	25678	0644	edit dl rm
test_sort_values.py	25358	0644	edit dl rm
test_to_dict.py	9989	0644	edit dl rm
test_to_period.py	984	0644	edit dl rm
test_to_records.py	13981	0644	edit dl rm
test_to_timestamp.py	4020	0644	edit dl rm
test_transpose.py	2426	0644	edit dl rm
test_truncate.py	4180	0644	edit dl rm
test_tz_convert.py	3415	0644	edit dl rm
test_tz_localize.py	666	0644	edit dl rm
test_update.py	4259	0644	edit dl rm
test_value_counts.py	2631	0644	edit dl rm
__init__.py	229	0644	edit dl rm

Edit: /usr/local/lib64/python3.6/site-packages/pandas/tests/frame/methods/test_assign.py (2982B)

import pytest

from pandas import DataFrame
import pandas._testing as tm

class TestAssign:
    def test_assign(self):
        df = DataFrame({"A": [1, 2, 3], "B": [4, 5, 6]})
        original = df.copy()
        result = df.assign(C=df.B / df.A)
        expected = df.copy()
        expected["C"] = [4, 2.5, 2]
        tm.assert_frame_equal(result, expected)

# lambda syntax
        result = df.assign(C=lambda x: x.B / x.A)
        tm.assert_frame_equal(result, expected)

# original is unmodified
        tm.assert_frame_equal(df, original)

# Non-Series array-like
        result = df.assign(C=[4, 2.5, 2])
        tm.assert_frame_equal(result, expected)
        # original is unmodified
        tm.assert_frame_equal(df, original)

result = df.assign(B=df.B / df.A)
        expected = expected.drop("B", axis=1).rename(columns={"C": "B"})
        tm.assert_frame_equal(result, expected)

# overwrite
        result = df.assign(A=df.A + df.B)
        expected = df.copy()
        expected["A"] = [5, 7, 9]
        tm.assert_frame_equal(result, expected)

# lambda
        result = df.assign(A=lambda x: x.A + x.B)
        tm.assert_frame_equal(result, expected)

def test_assign_multiple(self):
        df = DataFrame([[1, 4], [2, 5], [3, 6]], columns=["A", "B"])
        result = df.assign(C=[7, 8, 9], D=df.A, E=lambda x: x.B)
        expected = DataFrame(
            [[1, 4, 7, 1, 4], [2, 5, 8, 2, 5], [3, 6, 9, 3, 6]], columns=list("ABCDE")
        )
        tm.assert_frame_equal(result, expected)

def test_assign_order(self):
        # GH 9818
        df = DataFrame([[1, 2], [3, 4]], columns=["A", "B"])
        result = df.assign(D=df.A + df.B, C=df.A - df.B)

expected = DataFrame([[1, 2, 3, -1], [3, 4, 7, -1]], columns=list("ABDC"))
        tm.assert_frame_equal(result, expected)
        result = df.assign(C=df.A - df.B, D=df.A + df.B)

expected = DataFrame([[1, 2, -1, 3], [3, 4, -1, 7]], columns=list("ABCD"))

tm.assert_frame_equal(result, expected)

def test_assign_bad(self):
        df = DataFrame({"A": [1, 2, 3], "B": [4, 5, 6]})

# non-keyword argument
        msg = r"assign\(\) takes 1 positional argument but 2 were given"
        with pytest.raises(TypeError, match=msg):
            df.assign(lambda x: x.A)
        msg = "'DataFrame' object has no attribute 'C'"
        with pytest.raises(AttributeError, match=msg):
            df.assign(C=df.A, D=df.A + df.C)

def test_assign_dependent(self):
        df = DataFrame({"A": [1, 2], "B": [3, 4]})

result = df.assign(C=df.A, D=lambda x: x["A"] + x["C"])
        expected = DataFrame([[1, 3, 1, 2], [2, 4, 2, 4]], columns=list("ABCD"))
        tm.assert_frame_equal(result, expected)

result = df.assign(C=lambda df: df.A, D=lambda df: df["A"] + df["C"])
        expected = DataFrame([[1, 3, 1, 2], [2, 4, 2, 4]], columns=list("ABCD"))
        tm.assert_frame_equal(result, expected)

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