from robobrowser import RoboBrowser

s = requests.Session()

browser = RoboBrowser(session=s, history=True, parser='html.parser')
browser.open('https://www.miweb.com/')
print(str(browser.parsed))
form = browser.get_form(id="form_client_login")

form["cl_email"].value = 'ejemplo@gmail.com'
form["cl_pass"].value = 'admin'

browser.submit_form(form)
print(str(browser.select))

<div class="row display_body">

            <div class="col-xs-7">

                                    <form id="form_client_login" class="modal_form modal_client_form">
                                            <input accesskey="e" type="email" class="form-control form_field cl_field_top" id="cl_email" name="cl_email" placeholder="Email" maxlength="75" title="Por favor, introduce tu email de usuario" data-toggle="tooltip" data-validation-engine="validate[required]" role="textbox" aria-required="true" aria-labelledby="titleClientRegistered subTitleClientRegistered" tabindex=1>

                    <input accesskey="c" type="password" class="form-control form_field cl_field_bottom" id="cl_pass" name="cl_pass" placeholder="Contraseña" maxlength="25" title="Por favor, introduce tu contraseña (min. 8 car. números y/o letras)" data-toggle="tooltip" data-validation-engine="validate[required]" role="textbox" aria-required="true" tabindex=2>
                </form>


                                    <div class="links_container">
                    <a accesskey="o" tabindex="4" role="button" href="#" class="cursor_pointer pass_forget">Olvidé mi contraseña</a>
                </div>

            </div>

            <div class="col-xs-5">
                <img alt="Imagen Ya soy cliente" class="img-responsive img_client img_login" src="https://www.miweb.com/content/themes/miwebth/view/assets/img/preindex_registrado.png" />
            </div>

        </div>

if ( $("#form_client_login").validationEngine('validate')  ) {
            hideAlertMessage(".client_form_alert");
            var l = Ladda.create(this);
            l.start();
            $.ajax ({
                method: "POST",
                url: "https://www.miweb.com/content/themes/miwebth/view/functions/ajax_apiCinfo.php",
                dataType: "json",
                data: {
                    resource: "login",
                    cl_email: $("#cl_email").val(),
                    cl_pass: $("#cl_pass").val(),
                    lang: "es"
                },
                error: function(XMLHttpRequest, textStatus, errorThrown){
                    showAlertMessage(transApiMessage.errorHTTP, ".client_form_alert", "warning");
                    l.stop();
                },
                success: function( user ) {
                    //dataParsedJson = $.parseJSON(user);

                    if (user.dato) {
                        currentUser = user.dato;
                    }

<div class="col-xs-5">
                <button accesskey="a" aria-label="YA SOY CLIENTE. Por favor, identifícate. ACCEDER" id="btn_client_access" class="btn principal_btn btn_client_access ladda-button" data-style="zoom-out" tabindex=3>
                    <span class="ladda-label">ACCEDER <span class="gadico i-flecha-avanzar icon_left_btn"></span></span>
                </button>
            </div>