Import modules from a list in Python

Instead of mapping them to ___import__ all at one, just append each module to the list modules one at a time inside the for-loop:

imports = ['sys', 'itertools', 'datetime', 'os']
modules = []
for x in imports:
    try:
        modules.append(__import__(x))
        print "Successfully imported ", x, '.'
    except ImportError:
        print "Error importing ", x, '.'

Note however that most Python programmers prefer the use of importlib.import_module rather than __import__ for this task.

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Note too that it might be better to make modules a dictionary instead of a list:

imports = ['sys', 'itertools', 'datetime', 'os']
modules = {}
for x in imports:
    try:
        modules[x] = __import__(x)
        print "Successfully imported ", x, '.'
    except ImportError:
        print "Error importing ", x, '.'

Now, instead of by index:

modules[0].version
modules[3].path

you can access the modules by name:

modules["sys"].version
modules["os"].path

This worked for me on Python 3.7

modules = ["sys","os","platform","random","time","functools"]

for library in modules:
try:
    exec("import {module}".format(module=library))
except Exception as e:
    print(e)
print(sys.argv)

Importing a submodule:

modules = ["PyQt5"] # pip install PyQt5
submodules = ["QtCore"]

for library in modules:
    for sublibrary in submodules:
        try:
            exec("from {m} import {s}".format(m=library, s=sublibrary))
        except Exception as e:
            print(e)
print(dir()) # Includes QtCore
print(dir(QtCore)) # All functions, classes and variables are exactly correct as with "from PyQt5 import QtCore"

Importing everything:

modules = ["sys","os","platform","random","time","functools"]
for library in modules:
    try:
        exec("from {module} import *".format(module=library))
    except Exception as e:
        print(e)
print(dir()) # Exactly working as thought

Importing a instance or something:

modules = ["PyQt5"] # pip install PyQt5
submodules = ["QtCore"]
func = ["QCoreApplication"]
for library in modules:
    for f in func:
        for sublibrary in submodules:
            try:
                exec("from {m}.{s} import {f}".format(m=library, s=sublibrary, f=f)) 
            except Exception as e:
                print(e)
print(dir()) # Includes QCoreApplication instance

Importing everything from a modules's submodule:

modules = ["PyQt5"] # pip install PyQt5
submodules = ["QtCore"]
for library in modules:
    for sublibrary in submodules:
        try:
            exec("from {m}.{s} import *".format(m=library, s=sublibrary)) # Didn't mention f"" strings all the times. But for beginners .format is better.
        except Exception as e:
            print(e)
print(dir()) # Includes all PyQt5.QtCore stuff