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Commit 15852db

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‎README.md

Lines changed: 49 additions & 49 deletions
Original file line numberDiff line numberDiff line change
@@ -136,7 +136,7 @@ assert 语句也是如此。
136136
算法和程序设计技术先驱,计算机排版系统 TEX 和 METAFONT 的发明者 Donald Knuth,推荐使用以下形式:
137137

138138
```Python
139-
# Yes: easy to match operators with operands
139+
# 是: easy to match operators with operands
140140
income = (gross_wages
141141
+ taxable_interest
142142
+ (dividends - qualified_dividends)
@@ -165,11 +165,11 @@ Python 2 默认ASCII,Python 3 默认UTF-8。
165165
<h3 id="3.7">模块导入</h3>
166166

167167
```Python
168-
YES: from subprocess import Popen, PIPE
168+
是: from subprocess import Popen, PIPE
169169
import os
170170
import sys
171171

172-
NO: import sys, os
172+
否: import sys, os
173173
```
174174

175175
模块导入总是位于文件顶部,在模块注释和文档字符串之后,模块全局变量和常量之前。
@@ -248,40 +248,40 @@ import sys
248248
在以下场景避免不必要的空格
249249

250250
```Python
251-
Yes: spam(ham[1], {eggs: 2})
252-
No: spam( ham[ 1 ], { eggs: 2 } )
251+
是: spam(ham[1], {eggs: 2})
252+
否: spam( ham[ 1 ], { eggs: 2 } )
253253

254-
Yes: foo = (0,)
255-
No: bar = (0, )
254+
是: foo = (0,)
255+
否: bar = (0, )
256256

257-
Yes: if x == 4: print x, y; x, y = y, x
258-
No: if x == 4 : print x , y ; x , y = y , x
257+
是: if x == 4: print x, y; x, y = y, x
258+
否: if x == 4 : print x , y ; x , y = y , x
259259

260-
Yes:
260+
是:
261261
ham[1:9], ham[1:9:3], ham[:9:3], ham[1::3], ham[1:9:]
262262
ham[lower:upper], ham[lower:upper:], ham[lower::step]
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ham[lower+offset : upper+offset]
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ham[: upper_fn(x) : step_fn(x)], ham[:: step_fn(x)]
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ham[lower + offset : upper + offset]
266266

267-
No:
267+
否:
268268
ham[lower + offset:upper + offset]
269269
ham[1: 9], ham[1 :9], ham[1:9 :3]
270270
ham[lower : : upper]
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ham[ : upper]
272272

273-
Yes: spam(1)
274-
No: spam (1)
273+
是: spam(1)
274+
否: spam (1)
275275

276-
Yes: dct['key'] = lst[index]
277-
No: dct ['key'] = lst [index]
276+
是: dct['key'] = lst[index]
277+
否: dct ['key'] = lst [index]
278278

279-
Yes:
279+
是:
280280
x = 1
281281
y = 2
282282
long_variable = 3
283283

284-
No:
284+
否:
285285
x = 1
286286
y = 2
287287
long_variable = 3
@@ -294,15 +294,15 @@ long_variable = 3
294294
在二元运算符周围使用空格:
295295

296296
```python
297-
Yes:
297+
是:
298298

299299
i = i + 1
300300
submitted += 1
301301
x = x*2 - 1
302302
hypot2 = x*x + y*y
303303
c = (a+b) * (a-b)
304304

305-
No:
305+
否:
306306

307307
i=i+1
308308
submitted +=1
@@ -313,24 +313,24 @@ c = (a + b) * (a - b)
313313
表示关键字参数货默认参数值时,不要使用空格:
314314

315315
```python
316-
Yes:
316+
是:
317317

318318
def complex(real, imag=0.0):
319319
return magic(r=real, i=imag)
320-
No:
320+
否:
321321

322322
def complex(real, imag = 0.0):
323323
return magic(r = real, i = imag)
324324
```
325325
函数注释的场景:
326326

327327
```python
328-
Yes:
328+
是:
329329

330330
def munge(input: AnyStr): ...
331331
def munge() -> AnyStr: ...
332332

333-
No:
333+
否:
334334

335335
def munge(input:AnyStr): ...
336336
def munge()->PosInt: ...
@@ -339,12 +339,12 @@ def munge()->PosInt: ...
339339
当参数注释和默认值共存时:
340340

341341
```python
342-
Yes:
342+
是:
343343

344344
def munge(sep: AnyStr = None): ...
345345
def munge(input: AnyStr, sep: AnyStr = None, limit=1000): ...
346346

347-
No:
347+
否:
348348

349349
def munge(input: AnyStr=None): ...
350350
def munge(input: AnyStr, limit = 1000): ...
@@ -353,7 +353,7 @@ def munge(input: AnyStr, limit = 1000): ...
353353
复合声明不建议使用:
354354

355355
```python
356-
Yes:
356+
是:
357357

358358
if foo == 'blah':
359359
do_blah_thing()
@@ -394,7 +394,7 @@ if foo == 'blah': one(); two(); three()
394394
单元素元组强制使用逗号:
395395

396396
```python
397-
Yes:
397+
是:
398398

399399
FILES = ('setup.cfg',)
400400

@@ -404,7 +404,7 @@ FILES = 'setup.cfg',
404404
```
405405
当使用版本控制系统时,一组希望后续扩展的值/参数/改善的条目使用以下形式:
406406
```python
407-
Yes:
407+
是:
408408

409409
FILES = [
410410
'setup.cfg',
@@ -413,7 +413,7 @@ FILES = [
413413
initialize(FILES,
414414
error=True,
415415
)
416-
No:
416+
否:
417417

418418
FILES = ['setup.cfg', 'tox.ini',]
419419
initialize(FILES, error=True,)
@@ -595,11 +595,11 @@ Imported names should always be considered an implementation detail. Other modul
595595

596596
* 尽管功能相同,从可读性上考虑:
597597
```python
598-
Yes:
598+
是:
599599

600600
if foo is not None:
601601

602-
No:
602+
否:
603603

604604
if not foo is None:
605605
```
@@ -608,11 +608,11 @@ if not foo is None:
608608

609609
* 使用 def 语句而不是赋值语句直接绑定一个 lambda 表达式到标志符上:
610610
```python
611-
Yes:
611+
是:
612612

613613
def f(x): return 2*x
614614

615-
No:
615+
否:
616616

617617
f = lambda x: 2*x
618618
```
@@ -644,7 +644,7 @@ except Exception as exc:
644644

645645
* 对于所有的 try/except 子句,将 try 子句限制为必需的绝对最小代码量避免隐藏错误
646646
```python
647-
Yes:
647+
是:
648648

649649
try:
650650
value = collection[key]
@@ -653,7 +653,7 @@ except KeyError:
653653
else:
654654
return handle_value(value)
655655

656-
No:
656+
否:
657657

658658
try:
659659
# Too broad!
@@ -667,20 +667,20 @@ except KeyError:
667667

668668
* 除了申请和释放资源,任何时候都应该使用单独的函数和方法调用 Context managers,e.g:
669669
```python
670-
Yes:
670+
是:
671671

672672
with conn.begin_transaction():
673673
do_stuff_in_transaction(conn)
674674

675-
No:
675+
否:
676676

677677
with conn:
678678
do_stuff_in_transaction(conn)
679679
```
680680

681681
* 返回值要一致,be consistent:
682682
```
683-
Yes:
683+
是:
684684
685685
def foo(x):
686686
if x >= 0:
@@ -693,7 +693,7 @@ def bar(x):
693693
return None
694694
return math.sqrt(x)
695695
696-
No:
696+
否:
697697
698698
def foo(x):
699699
if x >= 0:
@@ -709,15 +709,15 @@ def bar(x):
709709

710710
* 使用 ''.startswith() 和 ''.endswith() 而不是字符串切片来检查前缀或后缀,e.g:
711711
```python
712-
Yes: if foo.startswith('bar'):
713-
No: if foo[:3] == 'bar':
712+
是: if foo.startswith('bar'):
713+
否: if foo[:3] == 'bar':
714714
```
715715

716716
* 对象类型比较因该使用isinstance() 而不是直接比较,e.g:
717717
```python
718-
Yes: if isinstance(obj, int):
718+
是: if isinstance(obj, int):
719719

720-
No: if type(obj) is type(1):
720+
否: if type(obj) is type(1):
721721
```
722722
在 Python 2 中,string 和 unicode 公共基类是 basestring,因此:
723723
```python
@@ -726,20 +726,20 @@ if isinstance(obj, basestring):
726726

727727
* 对于序列(字符串,列表,元组),空的序列是 false:
728728
```python
729-
Yes: if not seq:
730-
if seq:
729+
是:if not seq:
730+
if seq:
731731

732-
No: if len(seq):
732+
否:if len(seq):
733733
if not len(seq):
734734
```
735735

736736
* 不要使用尾随空格
737737

738738
* 不要使用 == 比较布尔值:
739739
```python
740-
Yes: if greeting:
741-
No: if greeting == True:
742-
Worse: if greeting is True:
740+
是: if greeting:
741+
否: if greeting == True:
742+
糟糕: if greeting is True:
743743
```
744744

745745
<h2 id="9.1">函数注释</h2>

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