Importing every public name from a module using a wildcard (from mymodule import *) is a bad idea because:

Remember that imported names can change when you update your dependencies. A wildcard import which works today might be broken tomorrow.

There are two ways to avoid a wildcard import:

Noncompliant Code Example

from math import *  # Noncompliant
def exp(x):
    pass
print(exp(0))   # "None" will be printed

Compliant Solution

import math
def exp(x):
    pass
print(math.exp(0))   # "1.0" will be printed

Or

from math import exp as m_exp
def exp(x):
    pass
print(m_exp(0))   # "1.0" will be printed

Exceptions

No issue will be raised in __init__.py files. Wildcard imports are a common way of populating these modules.

No issue will be raised in modules doing only imports. Local modules are sometimes created as a proxy for third-party modules.

# file: mylibrary/pyplot.py
try:
    from guiqwt.pyplot import *  # Ok
except Exception:
    from matplotlib.pyplot import *  # Ok

Just keep in mind that wildcard imports might still create issues in these cases. It's always better to import only what you need.

See