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python菜鳥函數(shù),Python函數(shù)

Python菜鳥求助 calc函數(shù)要怎么穿進去才不報錯?。?/h2>

def?calc(average):

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sum=0

for?i?in?average:

sum+=i

return?(sum/3)

print(calc([1,2,3]))

關(guān)于python的菜鳥問題

代碼解釋如下:

input_file作為變量,指的是一個文件的路徑;

current_file = open(input_file)這一句獲取input_file的內(nèi)容,這時候current_file 相當于f;

print_all (current_file)就是用current_file調(diào)用了print_all 函數(shù),此時f=current_file;

此時,解決了提問者的第一個疑問。

def是定義函數(shù)的一個聲明語句,語法結(jié)構(gòu)如下:

def?FunctionName(para1,para2):

print?"創(chuàng)建示例"

所以:

def?print_all(f):

print?f.read()定義了一個print_all的函數(shù),該函數(shù)有一個變量稱作f;

print f.read()是這個函數(shù)的執(zhí)行語句;

菜鳥求大大們解釋Python里str函數(shù)和repr函數(shù)的區(qū)別

簡單來說

str()將數(shù)值轉(zhuǎn)成字符串

repr()將對象轉(zhuǎn)成字符串顯示,注意只是顯示,有些對象轉(zhuǎn)成字符串沒有意義。如list,dict使用str()是無效的,但使用repr可以,這是為了顯示他們的值

以下內(nèi)容摘自google

The str() function is meant to return representations of values which are fairly

human-readable, while repr() is meant to generate representations which can be read by the interpreter (or will force a SyntaxError if there is not equivalent syntax). For

objects which don't have a particular representation for human consumption, str() will

return the same value as repr(). Many values, such as numbers or structures like lists

and dictionaries, have the same representation using either function. Strings and

floating point numbers, in particular, have two distinct representations.

Some examples:

s = 'Hello, world.'

str(s)

'Hello, world.'

repr(s)

"'Hello, world.'"

str(0.1)

'0.1'

repr(0.1)

'0.10000000000000001'

x = 10 * 3.25

y = 200 * 200

s = 'The value of x is ' + repr(x) + ', and y is ' + repr(y) + '...'

print s

The value of x is 32.5, and y is 40000...

# The repr() of a string adds string quotes and backslashes:

hello = 'hello, world\n'

hellos = repr(hello)

print hellos

'hello, world\n'

# The argument to repr() may be any Python object:

repr((x, y, ('spam', 'eggs')))

"(32.5, 40000, ('spam', 'eggs'))"

# reverse quotes are convenient in interactive sessions:

`x, y, ('spam', 'eggs')`

"(32.5, 40000, ('spam', 'eggs'))"


新聞標題:python菜鳥函數(shù),Python函數(shù)
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