1.modname = "string"
exec("import" + modname)
2.modname = "string"
eval("import" + modname)
3.modname = "string"
string = __import__(modname)
1.modname = "string"
exec("import" + modname)
2.modname = "string"
eval("import" + modname)
3.modname = "string"
string = __import__(modname)