diff --git a/parakeet/frontend/cn_normalization/chronology.py b/parakeet/frontend/cn_normalization/chronology.py
index 1d9520e..b8d7115 100644
--- a/parakeet/frontend/cn_normalization/chronology.py
+++ b/parakeet/frontend/cn_normalization/chronology.py
@@ -33,7 +33,15 @@ RE_TIME = re.compile(r'([0-1]?[0-9]|2[0-3])'
                      r'(:([0-5][0-9]))?')
 
 
-def replace_time(match: re.Match) -> str:
+def replace_time(match) -> str:
+    """
+    Parameters
+    ----------
+    match : re.Match
+    Returns
+    ----------
+    str
+    """
     hour = match.group(1)
     minute = match.group(2)
     second = match.group(4)
@@ -51,7 +59,15 @@ RE_DATE = re.compile(r'(\d{4}|\d{2})年'
                      r'(((0?[1-9])|((1|2)[0-9])|30|31)([日号]))?')
 
 
-def replace_date(match: re.Match) -> str:
+def replace_date(match) -> str:
+    """
+    Parameters
+    ----------
+    match : re.Match
+    Returns
+    ----------
+    str
+    """
     year = match.group(1)
     month = match.group(3)
     day = match.group(5)
@@ -70,7 +86,15 @@ RE_DATE2 = re.compile(
     r'(\d{4})([- /.])(0[1-9]|1[012])\2(0[1-9]|[12][0-9]|3[01])')
 
 
-def replace_date2(match: re.Match) -> str:
+def replace_date2(match) -> str:
+    """
+    Parameters
+    ----------
+    match : re.Match
+    Returns
+    ----------
+    str
+    """
     year = match.group(1)
     month = match.group(3)
     day = match.group(4)
diff --git a/parakeet/frontend/cn_normalization/num.py b/parakeet/frontend/cn_normalization/num.py
index e07dd80..4b7c05f 100644
--- a/parakeet/frontend/cn_normalization/num.py
+++ b/parakeet/frontend/cn_normalization/num.py
@@ -34,7 +34,15 @@ COM_QUANTIFIERS = '(朵|匹|张|座|回|场|尾|条|个|首|阙|阵|网|炮|顶|
 RE_FRAC = re.compile(r'(-?)(\d+)/(\d+)')
 
 
-def replace_frac(match: re.Match) -> str:
+def replace_frac(match) -> str:
+    """
+    Parameters
+    ----------
+    match : re.Match
+    Returns
+    ----------
+    str
+    """
     sign = match.group(1)
     nominator = match.group(2)
     denominator = match.group(3)
@@ -49,7 +57,15 @@ def replace_frac(match: re.Match) -> str:
 RE_PERCENTAGE = re.compile(r'(-?)(\d+(\.\d+)?)%')
 
 
-def replace_percentage(match: re.Match) -> str:
+def replace_percentage(match) -> str:
+    """
+    Parameters
+    ----------
+    match : re.Match
+    Returns
+    ----------
+    str
+    """
     sign = match.group(1)
     percent = match.group(2)
     sign: str = "负" if sign else ""
@@ -63,7 +79,15 @@ def replace_percentage(match: re.Match) -> str:
 RE_INTEGER = re.compile(r'(-)' r'(\d+)')
 
 
-def replace_negative_num(match: re.Match) -> str:
+def replace_negative_num(match) -> str:
+    """
+    Parameters
+    ----------
+    match : re.Match
+    Returns
+    ----------
+    str
+    """
     sign = match.group(1)
     number = match.group(2)
     sign: str = "负" if sign else ""
@@ -77,7 +101,15 @@ def replace_negative_num(match: re.Match) -> str:
 RE_DEFAULT_NUM = re.compile(r'\d{3}\d*')
 
 
-def replace_default_num(match: re.Match):
+def replace_default_num(match):
+    """
+    Parameters
+    ----------
+    match : re.Match
+    Returns
+    ----------
+    str
+    """
     number = match.group(0)
     return verbalize_digit(number)
 
@@ -90,7 +122,15 @@ RE_POSITIVE_QUANTIFIERS = re.compile(r"(\d+)([多余几])?" + COM_QUANTIFIERS)
 RE_NUMBER = re.compile(r'(-?)((\d+)(\.\d+)?)' r'|(\.(\d+))')
 
 
-def replace_positive_quantifier(match: re.Match) -> str:
+def replace_positive_quantifier(match) -> str:
+    """
+    Parameters
+    ----------
+    match : re.Match
+    Returns
+    ----------
+    str
+    """
     number = match.group(1)
     match_2 = match.group(2)
     match_2: str = match_2 if match_2 else ""
@@ -100,7 +140,15 @@ def replace_positive_quantifier(match: re.Match) -> str:
     return result
 
 
-def replace_number(match: re.Match) -> str:
+def replace_number(match) -> str:
+    """
+    Parameters
+    ----------
+    match : re.Match
+    Returns
+    ----------
+    str
+    """
     sign = match.group(1)
     number = match.group(2)
     pure_decimal = match.group(5)
@@ -118,7 +166,15 @@ def replace_number(match: re.Match) -> str:
 RE_RANGE = re.compile(r'(\d+)[-~](\d+)')
 
 
-def replace_range(match: re.Match) -> str:
+def replace_range(match) -> str:
+    """
+    Parameters
+    ----------
+    match : re.Match
+    Returns
+    ----------
+    str
+    """
     first, second = match.group(1), match.group(2)
     first: str = num2str(first)
     second: str = num2str(second)
diff --git a/parakeet/frontend/cn_normalization/phonecode.py b/parakeet/frontend/cn_normalization/phonecode.py
index 437348c..be159c2 100644
--- a/parakeet/frontend/cn_normalization/phonecode.py
+++ b/parakeet/frontend/cn_normalization/phonecode.py
@@ -40,9 +40,25 @@ def phone2str(phone_string: str, mobile=True) -> str:
         return result
 
 
-def replace_phone(match: re.Match) -> str:
+def replace_phone(match) -> str:
+    """
+    Parameters
+    ----------
+    match : re.Match
+    Returns
+    ----------
+    str
+    """
     return phone2str(match.group(0), mobile=False)
 
 
-def replace_mobile(match: re.Match) -> str:
+def replace_mobile(match) -> str:
+    """
+    Parameters
+    ----------
+    match : re.Match
+    Returns
+    ----------
+    str
+    """
     return phone2str(match.group(0))
diff --git a/parakeet/frontend/cn_normalization/quantifier.py b/parakeet/frontend/cn_normalization/quantifier.py
index f40867f..d3805a3 100644
--- a/parakeet/frontend/cn_normalization/quantifier.py
+++ b/parakeet/frontend/cn_normalization/quantifier.py
@@ -20,7 +20,15 @@ from .num import num2str
 RE_TEMPERATURE = re.compile(r'(-?)(\d+(\.\d+)?)(°C|℃|度|摄氏度)')
 
 
-def replace_temperature(match: re.Match) -> str:
+def replace_temperature(match) -> str:
+    """
+    Parameters
+    ----------
+    match : re.Match
+    Returns
+    ----------
+    str
+    """
     sign = match.group(1)
     temperature = match.group(2)
     unit = match.group(3)