2019-05-24
--------------------------------
一、
# splitlines() 以换行切割字符串
s = '''日照香炉生紫烟\n疑是银河落九天\n飞流直下三千尺'''
print(s.splitlines())
二、
# join() 将列表按照指定字符串连接
list1 = ['日照香炉生紫烟','疑是银河落九天','飞流直下三千尺']
s = '*'.join(list1)
print(s)
三、
# ljust() 指定字符串的长度，内容靠左边
s = 'abc'
print(len(s))
print(s.ljust(5, '#'))
四、
s = 'abc'
print(len(s))
print(s.ljust(5)+'aa')
print(s.center(5, '#'))
print(s.rjust(5, '#'))
# 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
print('- - -'+s.strip()+'- - -')
print('- - -'+s+'- - -')
print(s.lstrip('a'))
print(s.lstrip('b'))
print(s.rstrip('c'))
s = 'abc'
print(s.zfill(5))
# 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))
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
list1 = [1,2,3,4,5]
print(list1.append(5))
list1 = [1,1,2,5,1,3]
print(list1.count(5))
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)
list1 = [1,2,3,4,5,3]
print(list1.index(3))
#print(list1.index)
print(list1.index(3, 2, 5))
list1 = [1,2,3,4,5]
list1.insert(2,9)
print(list1)
list1 = [1,2,3,4,5]
list1.pop()
print(list1)
list1 = ['a', 'b', 'c', 'd', 'e']
list1.remove('b')
print(list1)
list1 = [5,2,4,6,1,9]
list1.sort()
print(list1)
list1 = [1,2,3,4]
list1.reverse()
print(list1)
list1 = [5,2,4,6,1,9]
list1.sort()
print(list1)
list1.sort(reverse=True)
tuple1 = (3, 2, 4, 1, 3, 6)
print(tuple1.count(3))
tuple1 = (3, 2, 4, 1, 3, 6)
print(tuple1.index(3))
tuple1 = (3, 2, 4, 1, 3, 6)
print(tuple1.index(3))
print(tuple1.index(3,1,5))
dict1 = {'a':1, 'b':2, 'c':3}
dict2 = dict1.copy()
print(dict2)
list1 = ['a', 'b', 'c']
dict1 = {}.fromkeys(list1)
dict2 = {}.fromkeys(list1, 3)
print(dict1,dict2)
dict1 = {'a':1, 'b':2, 'c':3}
print(dict1.get('b'))
dict1 = {'a':1, 'b':2, 'c':3}
print(dict1.get('b'))
print(dict1.get('d'))
print(dict1.get('d', 4))
dict1 = {'a':1, 'b':2, 'c':3}
for k,v in dict1.items():
print(k,v)
dict1 = {'d':4, 'a':1, 'b':2, 'c':3}
print(dict1.popitem())
dict1 = {'d':4, 'a':1, 'b':2, 'c':3}
print(dict1.setdefault('e',5))
print(dict1)
dict1 = {'d':4, 'a':1, 'b':2, 'c':3}
dict1.update({'a':3})
print(dict1)
class set(object)
| set() -> new empty set object
| set(iterable) -> new set object
|
| Build an unordered collection of unique elements.
|
| Methods defined here:
|
| __and__(self, value, /)
| Return self&value.
|
| __contains__(...)
| x.__contains__(y) <==> y in x.
|
| __eq__(self, value, /)
| Return self==value.
|
| __ge__(self, value, /)
| Return self>=value.
|
| __getattribute__(self, name, /)
| Return getattr(self, name).
|
| __gt__(self, value, /)
| Return self>value.
|
| __iand__(self, value, /)
| Return self&=value.
|
| __init__(self, /, *args, **kwargs)
| Initialize self. See help(type(self)) for accurate signature.
|
| __ior__(self, value, /)
| Return self|=value.
|
| __isub__(self, value, /)
| Return self-=value.
|
| __iter__(self, /)
| Implement iter(self).
|
| __ixor__(self, value, /)
| Return self^=value.
|
| __le__(self, value, /)
| Return self<=value.
|
| __len__(self, /)
| Return len(self).
|
| __lt__(self, value, /)
| Return self<value.
|
| __ne__(self, value, /)
| Return self!=value.
|
| __or__(self, value, /)
| Return self|value.
|
| __rand__(self, value, /)
| Return value&self.
|
| __reduce__(...)
| Return state information for pickling.
|
| __repr__(self, /)
| Return repr(self).
|
| __ror__(self, value, /)
| Return value|self.
|
| __rsub__(self, value, /)
| Return value-self.
|
| __rxor__(self, value, /)
| Return value^self.
|
| __sizeof__(...)
| S.__sizeof__() -> size of S in memory, in bytes
|
| __sub__(self, value, /)
| Return self-value.
|
| __xor__(self, value, /)
| Return self^value.
|
| add(...)
| Add an element to a set.
|
| This has no effect if the element is already present.
|
| clear(...)
| Remove all elements from this set.
|
| copy(...)
| Return a shallow copy of a set.
|
| difference(...)
| Return the difference of two or more sets as a new set.
|
| (i.e. all elements that are in this set but not the others.)
|
| difference_update(...)
| Remove all elements of another set from this set.
|
| discard(...)
| Remove an element from a set if it is a member.
|
| If the element is not a member, do nothing.
|
| intersection(...)
| Return the intersection of two sets as a new set.
|
| (i.e. all elements that are in both sets.)
|
| intersection_update(...)
| Update a set with the intersection of itself and another.
|
| isdisjoint(...)
| Return True if two sets have a null intersection.
|
| issubset(...)
| Report whether another set contains this set.
|
| issuperset(...)
| Report whether this set contains another set.
|
| pop(...)
| Remove and return an arbitrary set element.
| Raises KeyError if the set is empty.
|
| remove(...)
| Remove an element from a set; it must be a member.
|
| If the element is not a member, raise a KeyError.
|
| symmetric_difference(...)
| Return the symmetric difference of two sets as a new set.
|
| (i.e. all elements that are in exactly one of the sets.)
|
| symmetric_difference_update(...)
| Update a set with the symmetric difference of itself and another.
|
| union(...)
| Return the union of sets as a new set.
|
| (i.e. all elements that are in either set.)
|
| update(...)
| Update a set with the union of itself and others.
|
| ----------------------------------------------------------------------
| Static methods defined here:
|
print(a)
list1 = [1,2,3,4]
a = set(list1)
print(a)
set1 = {5, 1, 2, 3, 4}
set1.add(6)
print(set1)
a = {'a', 'b', 'f', 4}
a.pop()
print(a)
a = {'a', 'b', 'f', 4}
a.remove(4)
print(a)
a = {'a', 'b', 'f', 4}
a.discard(4)
print(a)
a = {'a', 'b', 'f', 4}
a.discard(4)
print(a)
a.discard(4)
print(a)
# difference_update() 区别就是第一个返回一个新的集合，第二个是把原来集合覆盖
set1 = {1,2,3,4,7}
set2 = {2,4,8,111,24}
set3 = set1.difference(set2)
print(set3)
set4 = set1.difference_update(set2)
print(set4)