Pandas で式を動的に評価するにはどうすればよいですか?

# Import necessary libraries
import pandas as pd
import numpy as np

# Create sample DataFrames
np.random.seed(0)
df1 = pd.DataFrame(np.random.choice(10, (5, 4)), columns=list('ABCD'))
df2 = pd.DataFrame(np.random.choice(10, (5, 4)), columns=list('ABCD'))

# Evaluate expression using a variable
x = 5
result = pd.eval("df1.A + (df1.B * x)")

# Alternatively, assign the result to a new column
pd.eval("df2['D'] = df1.A + (df1.B * x)")

df3 = pd.DataFrame(columns=list('FBGH'), index=df1.index)
pd.eval("df3['B'] = df1.A + df2.A", target=df3)

# In-place modification
pd.eval("df2.B = df1.A + df2.A", target=df2, inplace=True)

# Evaluate expression in df1
result = df1.eval("A + B")

# Perform variable substitution
df1.eval("A > @x", local_dict={'x': 5})