diff --git a/.github/workflows/github-actions.yml b/.github/workflows/github-actions.yml
index 8c0a1de3..06d631dd 100644
--- a/.github/workflows/github-actions.yml
+++ b/.github/workflows/github-actions.yml
@@ -58,7 +58,7 @@ jobs:
         coverage run --source=piecash setup.py test
     - name: Upload coverage data to coveralls.io
       run: |
-        python -m pip install coveralls==2.2
+        python -m pip install coveralls==3.3.1
         coveralls --service=github
       env:
         GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
diff --git a/gnucash_books/complex_sample.gnucash b/gnucash_books/complex_sample.gnucash
index 202a8033..f5fd79fd 100644
Binary files a/gnucash_books/complex_sample.gnucash and b/gnucash_books/complex_sample.gnucash differ
diff --git a/piecash/core/commodity.py b/piecash/core/commodity.py
index 4af2d703..96a4100a 100644
--- a/piecash/core/commodity.py
+++ b/piecash/core/commodity.py
@@ -77,9 +77,7 @@ class Price(DeclarativeBaseGuid):
         foreign_keys=[currency_guid],
     )
 
-    def __init__(
-        self, commodity, currency, date, value, type="unknown", source="user:price"
-    ):
+    def __init__(self, commodity, currency, date, value, type="unknown", source="user:price"):
         self.commodity = commodity
         self.currency = currency
         assert _type(date) is datetime.date
@@ -89,9 +87,7 @@ def __init__(
         self.source = source
 
     def __str__(self):
-        return "Price<{:%Y-%m-%d} : {} {}/{}>".format(
-            self.date, self.value, self.currency.mnemonic, self.commodity.mnemonic
-        )
+        return "Price<{:%Y-%m-%d} : {} {}/{}>".format(self.date, self.value, self.currency.mnemonic, self.commodity.mnemonic)
 
     def object_to_validate(self, change):
         if change[-1] != "deleted":
@@ -159,9 +155,7 @@ class Commodity(DeclarativeBaseGuid):
     def base_currency(self):
         b = self.book
         if b is None:
-            raise GnucashException(
-                "The commodity should be linked to a session to have a 'base_currency'"
-            )
+            raise GnucashException("The commodity should be linked to a session to have a 'base_currency'")
 
         if self.namespace == "CURRENCY":
             # get the base currency as first commodity in DB
@@ -238,6 +232,9 @@ def __str__(self):
     def precision(self):
         return len(str(self.fraction)) - 1
 
+    def is_currency(self):
+        return self.namespace == "CURRENCY"
+
     def currency_conversion(self, currency):
         """
         Return the latest conversion factor to convert self to currency
@@ -253,16 +250,12 @@ def currency_conversion(self, currency):
 
         """
         # conversion is done from self.commodity to commodity (if possible)
-        sc2c = (
-            self.prices.filter_by(currency=currency).order_by(Price.date.desc()).first()
-        )
+        sc2c = self.prices.filter_by(currency=currency).order_by(Price.date.desc()).first()
         if sc2c:
             return sc2c.value
 
         # conversion is done directly from commodity to self.commodity (if possible)
-        c2sc = (
-            currency.prices.filter_by(currency=self).order_by(Price.date.desc()).first()
-        )
+        c2sc = currency.prices.filter_by(currency=self).order_by(Price.date.desc()).first()
         if c2sc:
             return Decimal(1) / c2sc.value
 
@@ -285,9 +278,7 @@ def update_prices(self, start_date=None):
         .. todo:: add some frequency to retrieve prices only every X (week, month, ...)
         """
         if self.book is None:
-            raise GncPriceError(
-                "Cannot update price for a commodity not attached to a book"
-            )
+            raise GncPriceError("Cannot update price for a commodity not attached to a book")
 
         # get last_price updated
         last_price = self.prices.order_by(Price.date.desc()).limit(1).first()
@@ -298,7 +289,7 @@ def update_prices(self, start_date=None):
         if last_price:
             start_date = max(last_price.date + datetime.timedelta(days=1), start_date)
 
-        if self.namespace == "CURRENCY":
+        if self.is_currency():
             # get reference currency (from book.root_account)
             default_currency = self.base_currency
             if default_currency == self:
@@ -337,8 +328,6 @@ def object_to_validate(self, change):
     def validate(self):
         # check uniqueness of namespace/mnemonic
         try:
-            self.book.query(Commodity).filter_by(
-                namespace=self.namespace, mnemonic=self.mnemonic
-            ).one()
+            self.book.query(Commodity).filter_by(namespace=self.namespace, mnemonic=self.mnemonic).one()
         except MultipleResultsFound:
             raise ValueError("{} already exists in this book".format(self))
diff --git a/piecash/core/factories.py b/piecash/core/factories.py
index fa60b38e..97847577 100644
--- a/piecash/core/factories.py
+++ b/piecash/core/factories.py
@@ -30,7 +30,7 @@ def create_stock_accounts(
         :class:`piecash.core.account.Account`: a tuple with the account under the broker_account where the stock is held
         and the list of income accounts.
     """
-    if cdty.namespace == "CURRENCY":
+    if cdty.is_currency():
         raise GnucashException(
             "{} is a currency ! You can't create stock_accounts for currencies".format(
                 cdty
diff --git a/piecash/core/transaction.py b/piecash/core/transaction.py
index dfe5218a..f21488a6 100644
--- a/piecash/core/transaction.py
+++ b/piecash/core/transaction.py
@@ -314,7 +314,7 @@ def validate(self):
         if old["STATE_CHANGES"][-1] == "deleted":
             return
 
-        if self.currency.namespace != "CURRENCY":
+        if not self.currency.is_currency():
             raise GncValidationError(
                 "You are assigning a non currency commodity to a transaction"
             )
diff --git a/piecash/ledger.py b/piecash/ledger.py
index d4685603..65ac17d6 100644
--- a/piecash/ledger.py
+++ b/piecash/ledger.py
@@ -1,10 +1,11 @@
 from __future__ import unicode_literals
 
+import json
 import re
 from functools import singledispatch
 from locale import getdefaultlocale
 
-from .core import Transaction, Account, Commodity, Price, Book
+from .core import Account, Book, Commodity, Price, Transaction
 
 """original script from https://github.com/MatzeB/pygnucash/blob/master/gnucash2ledger.py by Matthias Braun matze@braunis.de
  adapted for:
@@ -27,34 +28,34 @@ def ledger(obj, **kwargs):
 
 
 CURRENCY_RE = re.compile("^[A-Z]{3}$")
-NUMBER_RE = re.compile("[0-9., ]")
+NUMBER_RE = re.compile(r"(^|\s+)[-+]?([0-9]*\.[0-9]+|[0-9]+)($|\s+)")  # regexp to identify a float with blank spaces
+NUMERIC_SPACE = re.compile(r"[0-9\s]")
+CHARS_ONLY = re.compile(r"[A-Za-z]+")
+
+
+def quote_commodity(mnemonic):
+    if not CHARS_ONLY.fullmatch(mnemonic):
+        return json.dumps(mnemonic)
+    else:
+        return mnemonic
 
 
 def format_commodity(mnemonic, locale):
-    if CURRENCY_RE.match(mnemonic):
-        # format the commodity
+    if CURRENCY_RE.match(mnemonic) or True:
+        # format the currency via BABEL if available and then remove the number/amount
         s = format_currency(0, 0, mnemonic, locale)
-
-        # remove the non currency part and real white spaces
         return NUMBER_RE.sub("", s)
     else:
-        if NUMBER_RE.search(mnemonic):
-            return '"{}"'.format(mnemonic)
-        else:
-            return mnemonic
-
-    return NUMBER_RE.sub("", s)
+        # just quote the commodity
+        return quote_commodity(mnemonic)
 
 
-def format_currency(
-    amount, decimals, currency, locale=False, decimal_quantization=True
-):
+def format_currency(amount, decimals, currency, locale=False, decimal_quantization=True):
+    currency = quote_commodity(currency)
     if locale is True:
         locale = getdefaultlocale()[0]
         if BABEL_AVAILABLE is False:
-            raise ValueError(
-                f"You must install babel ('pip install babel') to export to ledger in your locale '{locale}'"
-            )
+            raise ValueError(f"You must install babel ('pip install babel') to export to ledger in your locale '{locale}'")
         else:
             return babel.numbers.format_currency(
                 amount,
@@ -115,11 +116,7 @@ def _(tr, locale=False, **kwargs):
                 )
             )
         else:
-            s.append(
-                format_currency(
-                    split.value, tr.currency.precision, tr.currency.mnemonic, locale
-                )
-            )
+            s.append(format_currency(split.value, tr.currency.precision, tr.currency.mnemonic, locale))
 
         if split.memo:
             s.append(" ;   {:20}".format(split.memo))
@@ -157,9 +154,8 @@ def _(acc, short_account_names=False, **kwargs):
     if acc.description != "":
         res += "\tnote {}\n".format(acc.description)
 
-    res += '\tcheck commodity == "{}"\n'.format(
-        acc.commodity.mnemonic
-    )  # .replace('"', '\\"'))
+    if acc.commodity.is_currency():
+        res += '\tcheck commodity == "{}"\n'.format(acc.commodity.mnemonic)  # .replace('"', '\\"'))
     return res
 
 
@@ -192,18 +188,13 @@ def _(book, **kwargs):
     if kwargs.get("short_account_names"):  # check that no ambiguity in account names
         accounts = [acc.name for acc in book.accounts]
         if len(accounts) != len(set(accounts)):
-            raise ValueError(
-                "You have duplicate short names in your book. "
-                "You cannot use the 'short_account_names' option."
-            )
+            raise ValueError("You have duplicate short names in your book. " "You cannot use the 'short_account_names' option.")
     for acc in book.accounts:
         res.append(ledger(acc, **kwargs))
         res.append("\n")
 
     # Prices
-    for price in sorted(
-        book.prices, key=lambda x: (x.commodity_guid, x.currency_guid, x.date)
-    ):
+    for price in sorted(book.prices, key=lambda x: (x.commodity_guid, x.currency_guid, x.date)):
         res.append(ledger(price, **kwargs))
     res.append("\n")
 
diff --git a/piecash/scripts/export.py b/piecash/scripts/export.py
index 4438b868..be6990ef 100644
--- a/piecash/scripts/export.py
+++ b/piecash/scripts/export.py
@@ -66,3 +66,6 @@ def export(book, entities, output, inactive):
             )
 
             output.write(res)
+
+if __name__ == '__main__':
+    cli()
\ No newline at end of file
diff --git a/piecash/scripts/qif_export.py b/piecash/scripts/qif_export.py
index e754dd12..4ef8e64b 100644
--- a/piecash/scripts/qif_export.py
+++ b/piecash/scripts/qif_export.py
@@ -98,7 +98,7 @@ def sort_split(sp):
                 continue  # skip template transactions
 
             splits = sorted(tr.splits, key=sort_split)
-            if all(sp.account.commodity.namespace == "CURRENCY" for sp in splits):
+            if all(sp.account.commodity.is_currency() for sp in splits):
 
                 sp1, sp2 = splits[:2]
                 item = _qif.Transaction(