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| -rw-r--r-- | LectureNotesOnPython.html | 107 | ||||
| -rw-r--r-- | LectureNotesOnPython.rst | 139 |
2 files changed, 148 insertions, 98 deletions
diff --git a/LectureNotesOnPython.html b/LectureNotesOnPython.html index d8c31eb..3e55a72 100644 --- a/LectureNotesOnPython.html +++ b/LectureNotesOnPython.html @@ -818,12 +818,14 @@ in_both('apples', 'oranges')返回'aes'</p> <!-- 讨论软件工程认证数据输入问题。 --> <p><tt class="docutils literal">+</tt> 操作符用来连接， <tt class="docutils literal">*</tt> 操作符用来重复。</p> <p>列表的方法</p> +<blockquote> <p>append</p> <p>extend</p> <p>sort</p> -<p>t = ['d', 'c', 'e', 'b', 'a'] -t.sort() # 文t.sort()返回什么值？ -t</p> +<p>t = ['d', 'c', 'e', 'b', 'a']</p> +<p>t.sort() # 问t.sort()返回什么值？</p> +<p>t</p> +</blockquote> <p>sum - reduce方法，把几个值变成一个值</p> <p>map方法，把几个值变成另外几个值</p> <dl class="docutils"> @@ -848,27 +850,56 @@ t</p> </div> </blockquote> <p>pop</p> -<p>t = ['a', 'b', 'c'] -x = t.pop(1) # pop可不带参数，不带参数返回哪个值？</p> -<p>t = ['a', 'b', 'c'] -del t[1]</p> -<p>t = ['a', 'b', 'c', 'd', 'e', 'f'] -del t[1:5]</p> -<p>t = ['a', 'b', 'c'] -t.remove('b')</p> -<p>list_of_characters = list('spam') -list_of_words = 'spam should be filtered'.split() -list_of_words = 'spam-should-be-filtered'.split('-')</p> +<blockquote> +<div class="line-block"> +<div class="line">t = ['a', 'b', 'c']</div> +<div class="line">x = t.pop(1) # pop可不带参数，不带参数返回哪个值？</div> +</div> +</blockquote> +<p>del</p> +<blockquote> +<div class="line-block"> +<div class="line">t = ['a', 'b', 'c']</div> +<div class="line">del t[1]</div> +</div> +<div class="line-block"> +<div class="line">t = ['a', 'b', 'c', 'd', 'e', 'f']</div> +<div class="line">del t[1:5]</div> +</div> +</blockquote> +<p>remove</p> +<blockquote> +<div class="line-block"> +<div class="line">t = ['a', 'b', 'c']</div> +<div class="line">t.remove('b')</div> +</div> +</blockquote> +<p>split</p> +<blockquote> +<div class="line-block"> +<div class="line">list_of_characters = list('spam')</div> +<div class="line">list_of_words = 'spam should be filtered'.split()</div> +<div class="line">list_of_words = 'spam-should-be-filtered'.split('-')</div> +</div> +</blockquote> <p>join方法</p> -<p>','.join(['1','2','3'])</p> -<p>a = 'banana' -b = 'banana' -a is b # a与b是不是指向同一个值 -a == b</p> -<p>a = [1, 2, 3] -b = [1, 2, 3] -a is b # not identical, a and b are not the same object -a == b # equivalent though they have the same values</p> +<blockquote> +<div class="line-block"> +<div class="line">','.join(['1','2','3'])</div> +</div> +<div class="line-block"> +<div class="line">a = 'banana'</div> +<div class="line">b = 'banana'</div> +<div class="line">a is b # a与b是不是指向同一个值</div> +<div class="line">a == b</div> +</div> +<div class="line-block"> +<div class="line">a = [1, 2, 3]</div> +<div class="line">b = [1, 2, 3]</div> +<div class="line">a is b # not identical, a and b are not the same object</div> +<div class="line">a == b # equivalent though they have the same values</div> +</div> +</blockquote> <p>别名（Aliasing）</p> <p>a = [1, 2, 3] b = a @@ -880,6 +911,7 @@ error-prone（易错）</p> </div> <div class="section" id="id8"> <h1>列表作为参数</h1> +<blockquote> <div class="line-block"> <div class="line">def delete_head(t):</div> <div class="line-block"> @@ -891,19 +923,26 @@ error-prone（易错）</p> <div class="line">delete_head(letters) # letters and t points to the same list object.</div> <div class="line">letters</div> </div> +</blockquote> </div> <div class="section" id="append"> <h1>注意区别 <tt class="docutils literal">append</tt> 与 <tt class="docutils literal">+</tt> 操作符</h1> -<p>t1 = [1, 2] -t2 = t1.append(3) -t1 -[1, 2, 3] -t2</p> -<p>t3 = t1 + [4] -t3 -[1, 2, 3, 4] -t1 -[1, 2, 3]</p> +<blockquote> +<div class="line-block"> +<div class="line">t1 = [1, 2]</div> +<div class="line">t2 = t1.append(3)</div> +<div class="line">t1</div> +<div class="line">[1, 2, 3]</div> +<div class="line">t2</div> +</div> +<div class="line-block"> +<div class="line">t3 = t1 + [4]</div> +<div class="line">t3</div> +<div class="line">[1, 2, 3, 4]</div> +<div class="line">t1</div> +<div class="line">[1, 2, 3]</div> +</div> +</blockquote> <p>区别如下两个函数:</p> <blockquote> <dl class="docutils"> @@ -918,6 +957,7 @@ t1 <h1>字典（Dictionary）</h1> <p>Mutable</p> <p>超级有用</p> +<blockquote> <div class="line-block"> <div class="line">d = {} or d = dict()</div> </div> @@ -932,6 +972,7 @@ t1 <div class="line">'warm' in d</div> <div class="line">'温' in d.values()</div> </div> +</blockquote> <p>key</p> <p>value</p> <p>key-value pair (item)</p> diff --git a/LectureNotesOnPython.rst b/LectureNotesOnPython.rst index ae28903..52b2c2c 100644 --- a/LectureNotesOnPython.rst +++ b/LectureNotesOnPython.rst @@ -509,16 +509,18 @@ for x in []: 列表的方法 -append - -extend - -sort + append + + extend + + sort + + t = ['d', 'c', 'e', 'b', 'a'] -t = ['d', 'c', 'e', 'b', 'a'] -t.sort() # 文t.sort()返回什么值？ -t + t.sort() # 问t.sort()返回什么值？ + t + sum - reduce方法，把几个值变成一个值 map方法，把几个值变成另外几个值 @@ -542,41 +544,48 @@ filter方法，从几个值中选择符合条件的几个值 pop -t = ['a', 'b', 'c'] -x = t.pop(1) # pop可不带参数，不带参数返回哪个值？ - -t = ['a', 'b', 'c'] -del t[1] + | t = ['a', 'b', 'c'] + | x = t.pop(1) # pop可不带参数，不带参数返回哪个值？ + -t = ['a', 'b', 'c', 'd', 'e', 'f'] -del t[1:5] +del + | t = ['a', 'b', 'c'] + | del t[1] + + | t = ['a', 'b', 'c', 'd', 'e', 'f'] + | del t[1:5] + -t = ['a', 'b', 'c'] -t.remove('b') +remove + | t = ['a', 'b', 'c'] + | t.remove('b') + -list_of_characters = list('spam') -list_of_words = 'spam should be filtered'.split() -list_of_words = 'spam-should-be-filtered'.split('-') +split + | list_of_characters = list('spam') + | list_of_words = 'spam should be filtered'.split() + | list_of_words = 'spam-should-be-filtered'.split('-') + join方法 -','.join(['1','2','3']) - - -a = 'banana' -b = 'banana' -a is b # a与b是不是指向同一个值 -a == b - - -a = [1, 2, 3] -b = [1, 2, 3] -a is b # not identical, a and b are not the same object -a == b # equivalent though they have the same values - + | ','.join(['1','2','3']) + + + | a = 'banana' + | b = 'banana' + | a is b # a与b是不是指向同一个值 + | a == b + + + | a = [1, 2, 3] + | b = [1, 2, 3] + | a is b # not identical, a and b are not the same object + | a == b # equivalent though they have the same values + 别名（Aliasing） @@ -594,30 +603,30 @@ error-prone（易错） 列表作为参数 --------------------------------------------- -| def delete_head(t): -| del t[0] - -| letters = ['a', 'b', 'c'] -| delete_head(letters) # letters and t points to the same list object. -| letters - + | def delete_head(t): + | del t[0] + + | letters = ['a', 'b', 'c'] + | delete_head(letters) # letters and t points to the same list object. + | letters + 注意区别 ``append`` 与 ``+`` 操作符 ---------------------------------------------- -t1 = [1, 2] -t2 = t1.append(3) -t1 -[1, 2, 3] -t2 - - -t3 = t1 + [4] -t3 -[1, 2, 3, 4] -t1 -[1, 2, 3] - + | t1 = [1, 2] + | t2 = t1.append(3) + | t1 + | [1, 2, 3] + | t2 + + + | t3 = t1 + [4] + | t3 + | [1, 2, 3, 4] + | t1 + | [1, 2, 3] + 区别如下两个函数: @@ -638,17 +647,17 @@ Mutable 超级有用 -| d = {} or d = dict() - -| d = {'hot':'热', 'cool':'凉', 'cold':'冷'} -| d['warm'] = '温' -| d['warm'] -| d['freezing'] # KeyError -| len(d) - -| 'warm' in d -| '温' in d.values() - + | d = {} or d = dict() + + | d = {'hot':'热', 'cool':'凉', 'cold':'冷'} + | d['warm'] = '温' + | d['warm'] + | d['freezing'] # KeyError + | len(d) + + | 'warm' in d + | '温' in d.values() + key value |