fix #2690

gui/qt/main_window.py

@@ -52,6 +52,10 @@ from electrum import Transaction, mnemonic
 from electrum import util, bitcoin, commands, coinchooser
 from electrum import SimpleConfig, paymentrequest
 from electrum.wallet import Wallet, Multisig_Wallet
+try:
+    from electrum.plot import plot_history
+except:
+    plot_history = None
 
 from amountedit import AmountEdit, BTCAmountEdit, MyLineEdit, BTCkBEdit
 from qrcodewidget import QRCodeWidget, QRDialog
@@ -465,7 +469,7 @@ class ElectrumWindow(QMainWindow, MessageBoxMixin, PrintError):
         invoices_menu = wallet_menu.addMenu(_("Invoices"))
         invoices_menu.addAction(_("Import"), lambda: self.invoice_list.import_invoices())
         hist_menu = wallet_menu.addMenu(_("&History"))
-        hist_menu.addAction("Plot", self.plot_history_dialog)
+        hist_menu.addAction("Plot", self.plot_history_dialog).setEnabled(plot_history is not None)
         hist_menu.addAction("Export", self.export_history_dialog)
 
         wallet_menu.addSeparator()
@@ -2229,16 +2233,13 @@ class ElectrumWindow(QMainWindow, MessageBoxMixin, PrintError):
         self.show_message(_("Your wallet history has been successfully exported."))
 
     def plot_history_dialog(self):
-        try:
+        if plot_history is None:
-            from electrum.plot import plot_history
-            wallet = self.wallet
-            history = wallet.get_history()
-            if len(history) > 0:
-                plt = plot_history(self.wallet, history)
-                plt.show()
-        except BaseException as e:
-            self.show_error(str(e))
             return
+        wallet = self.wallet
+        history = wallet.get_history()
+        if len(history) > 0:
+            plt = plot_history(self.wallet, history)
+            plt.show()
 
     def do_export_history(self, wallet, fileName, is_csv):
         history = wallet.get_history()