# strip() 去掉左右两边指定字符,默认是去掉空格
# lstrip() 去掉左侧指定字符,默认空格
# rstrip() 去掉右侧指定字符,默认空格
s = ‘ abc ‘
print(‘- - -‘+s.strip()+‘- - -‘)
print(‘- - -‘+s+‘- - -‘)
s = ‘aaabcc‘
print(s.lstrip(‘a‘))
print(s.lstrip(‘b‘))
print(s.rstrip(‘b‘))
print(s.rstrip(‘c‘))
---------------------------------
六、
# zfill() 指定字符串长度
s = ‘abc‘
print(s.zfill(5))
---------------------------------
七、
# maketrans() 生成用于字符串的映射表
# translate() 进行字符串替换
s = ‘今天晚上我吃的是小炒肉,可好吃了‘
table = s.maketrans(‘小炒肉‘, ‘大白菜‘)
print(table)
print(s.translate(table))
--------------------------------
八、
help(list)
----------------------
Help on class list in module builtins:
class list(object)
| list(iterable=(), /)
|
| Built-in mutable sequence.
|
| If no argument is given, the constructor creates a new empty list.
| The argument must be an iterable if specified.
|
| Methods defined here:
|
| __add__(self, value, /)
| Return self+value.
|
| __contains__(self, key, /)
| Return key in self.
|
| __delitem__(self, key, /)
| Delete self[key].
|
| __eq__(self, value, /)
| Return self==value.
|
| __ge__(self, value, /)
| Return self>=value.
|
| __getattribute__(self, name, /)
| Return getattr(self, name).
|
| __getitem__(...)
| x.__getitem__(y) <==> x[y]
|
| __gt__(self, value, /)
| Return self>value.
|
| __iadd__(self, value, /)
| Implement self+=value.
|
| __imul__(self, value, /)
| Implement self*=value.
|
| __init__(self, /, *args, **kwargs)
| Initialize self. See help(type(self)) for accurate signature.
|
| __iter__(self, /)
| Implement iter(self).
|
| __le__(self, value, /)
| Return self<=value.
|
| __len__(self, /)
| Return len(self).
|
| __lt__(self, value, /)
| Return self<value.
|
| __mul__(self, value, /)
| Return self*value.
|
| __ne__(self, value, /)
| Return self!=value.
|
| __repr__(self, /)
| Return repr(self).
|
| __reversed__(self, /)
| Return a reverse iterator over the list.
|
| __rmul__(self, value, /)
| Return value*self.
|
| __setitem__(self, key, value, /)
| Set self[key] to value.
|
| __sizeof__(self, /)
| Return the size of the list in memory, in bytes.
|
| append(self, object, /)
| Append object to the end of the list.
|
| clear(self, /)
| Remove all items from list.
|
| copy(self, /)
| Return a shallow copy of the list.
|
| count(self, value, /)
| Return number of occurrences of value.
|
| extend(self, iterable, /)
| Extend list by appending elements from the iterable.
|
| index(self, value, start=0, stop=9223372036854775807, /)
| Return first index of value.
|
| Raises ValueError if the value is not present.
|
| insert(self, index, object, /)
| Insert object before index.
|
| pop(self, index=-1, /)
| Remove and return item at index (default last).
|
| Raises IndexError if list is empty or index is out of range.
|
| remove(self, value, /)
| Remove first occurrence of value.
|
| Raises ValueError if the value is not present.
|
| reverse(self, /)
| Reverse *IN PLACE*.
|
| sort(self, /, *, key=None, reverse=False)
| Stable sort *IN PLACE*.
|
| ----------------------------------------------------------------------
| Static methods defined here:
|
| __new__(*args, **kwargs) from builtins.type
| Create and return a new object. See help(type) for accurate signature.
|
| ----------------------------------------------------------------------
| Data and other attributes defined here:
|
| __hash__ = None
-----------------------------
九、
# append 向列表末尾添加新元素 返回值None
list1 = [1,2,3,4,5]
print(list1.append(5))
----------------------------
十、
# count() 计算某个元素在列表中出现的次数
list1 = [1,1,2,5,1,3]
print(list1.count(5))
----------------------------
十一、
# extend() 将一个列表继承另一个列表
list1 = [1,2,3,4,5]
list2 = [6,7,8,9,10]
list3 = list1.extend(list2)
print(list1)
print(list2)
print(list3)
print(list1 + list2)
------------------------------
十二、