bash：Python中出現意外令牌`newline'附近的語法錯誤號碼遊戲

Question

我試圖在Python中創建一個簡單的「猜數字遊戲」。

我的代碼：

minimum = 1 
maximum = 100 
current_number = 50 




def new_number(x): 
    global sign, current_number, minimum, maximum 
    if x == ">": 
     minimum = current_number + 1 
     curent_number = minimum + maximum/2 
     guess() 
    else: 
     maximum = current_number - 1 
     current_number = minimum + maximum/2 
     guess() 


print "Pick a number between 1 - 100, keep it in your head" 
print "I'm going to guess it within 6 guesses" 

def guess(): 
    print "Is your number > or < %d" % current_number 

guess() 

sign = raw_input(": ") 
new_number(sign) 

試圖以數字「27」來運行它，似乎對於第一次迭代做工精細。然而，輸入被放置在第二次迭代中，其中輸入==「>」，收到後：

bash: syntax error near unexpected token `newline' 

有該錯誤指向沒有具體的行號。我確定它與if x == ">":部分有關。

Answer 1

你不在循環中，你的'第二次迭代'根本不是python，你的python腳本已經返回。

檢查這些改變你的代碼：

minimum = 1 
maximum = 100 
current_number = 50 




def new_number(x): 
    global sign, current_number, minimum, maximum 
    if x == ">": 
     minimum = current_number + 1 
     current_number = (minimum + maximum)/2 
     guess() 
    else: 
     maximum = current_number - 1 
     current_number = (minimum + maximum)/2 
     guess() 


print "Pick a number between 1 - 100, keep it in your head" 
print "I'm going to guess it within 6 guesses" 

def guess(): 
    print "Is your number >, < or = %d" % current_number 

guess() 

while(1): 
    sign = raw_input(": ") 
    if (sign == '='): 
     break 
    new_number(sign) 

的問題是，當你在一個循環中沒有，當你的腳本第一次迭代之後返回，你可能在bash打< <enter>，讓你有一個bash錯誤。

我還建議你重構你的代碼以避免使用全局變量，看看：Why are global variables evil?看看這對你的代碼有什麼壞處。