所謂三體氣候模擬，就是將太陽出現的情況進行分類討論，然後將其呈現出來。比如說一顆太陽就是恆紀元，兩顆太陽可能是二日凌空或二日連珠，三顆太陽也可能是三日凌空或三日連珠。只要明白了這一點，這個三體氣候模擬的程式就很好寫了。
在寫程式前，得先導入乙個庫。由於三體問題的複雜性，我們姑且將三顆太陽出現的概率定位三分之一，也就是說要用到隨機的方法。所以我們這裡需要匯入random庫中的randint——隨機數函式。
from random import randint# 其中0代表該太陽為飛星，1代表該太陽出現
sun1 = randint(0, 1)
sun2 = randint(0, 1)
sun3 = randint(0, 1)
# 1~3分別代表不同的位置，如果位置相同就是連珠
sun1_pos = randint(1, 3)
sun2_pos = randint(1, 3)
sun3_pos = randint(1, 3)
weather = ""
era_mode = ""
完成變數設定後，就該考慮三體世界的氣候情況了。
依照書中的描述，我們可以分為（恆紀元就不討論了）：三顆飛星（即沒有太陽）、二日凌空、二日連珠、三日凌空和三日連珠
這麼一來，就可以開始寫程式了。
首先是沒有太陽，即三顆飛星情況：
if sun1 == sun2 == sun3 == 0: # 三顆太陽都沒有出現
weather = "三顆飛星"
era_mode = "亂紀元"
print(era_mode, weather) # 輸出氣候情況
if sun1 == 1 and sun2 == sun3 == 0:
era_mode = "恆紀元"
print(era_mode)
elif sun2 == 1 and sun1 == sun3 == 0:
era_mode = "恆紀元"
print(era_mode)
elif sun3 == 1 and sun1 == sun2 == 0:
era_mode = "恆紀元"
print(era_mode)
if sun1 == sun2 == sun3 == 1:
if sun1_pos == sun2_pos == sun3_pos:
weather = "三日連珠"
era_mode = "亂紀元"
print(era_mode, weather)
else:
weather = "三日凌空"
era_mode = "亂紀元"
print(era_mode, weather)
if sun1 == sun2 == 1:
if sun1_pos == sun2_pos:
weather = "二日連珠"
era_mode = "亂紀元"
print(era_mode, weather)
else:
weather = "二日凌空"
era_mode = "亂紀元"
print(era_mode, weather)
elif sun1 == sun3 == 1:
if sun1_pos == sun2_pos:
weather = "二日連珠"
era_mode = "亂紀元"
print(era_mode, weather)
else:
weather = "二日凌空"
era_mode = "亂紀元"
print(era_mode, weather)
elif sun2 == sun3 == 1:
if sun2_pos == sun3_pos:
weather = "二日連珠"
era_mode = "亂紀元"
print(era_mode, weather)
else:
weather = "二日凌空"
era_mode = "亂紀元"
print(era_mode, weather)
當然，你也可以用其他的方法讓氣候判斷的排序改變，比如可以全部把這些判斷啥的寫道不同的函式裡在進行判斷，但在這裡就不加以贅述。
最後把全部**放上來：
from random import randint
# 其中0代表該太陽為飛星，1代表該太陽出現
sun1 = randint(0, 1)
sun2 = randint(0, 1)
sun3 = randint(0, 1)
# 1~3分別代表不同的位置，如果位置相同就是連珠
sun1_pos = randint(1, 3)
sun2_pos = randint(1, 3)
sun3_pos = randint(1, 3)
weather = ""
era_mode = ""
if sun1 == sun2 == sun3 == 0: # 三顆太陽都沒有出現
weather = "三顆飛星"
era_mode = "亂紀元"
print(era_mode, weather) # 輸出氣候情況
elif sun1 == 1 and sun2 == sun3 == 0:
era_mode = "恆紀元"
print(era_mode)
elif sun2 == 1 and sun1 == sun3 == 0:
era_mode = "恆紀元"
print(era_mode)
elif sun3 == 1 and sun1 == sun2 == 0:
era_mode = "恆紀元"
print(era_mode)
elif sun1 == sun2 == sun3 == 1:
if sun1_pos == sun2_pos == sun3_pos:
weather = "三日連珠"
era_mode = "亂紀元"
print(era_mode, weather)
else:
weather = "三日凌空"
era_mode = "亂紀元"
print(era_mode, weather)
elif sun1 == sun2 == 1:
if sun1_pos == sun2_pos:
weather = "二日連珠"
era_mode = "亂紀元"
print(era_mode, weather)
else:
weather = "二日凌空"
era_mode = "亂紀元"
print(era_mode, weather)
elif sun1 == sun3 == 1:
if sun1_pos == sun2_pos:
weather = "二日連珠"
era_mode = "亂紀元"
print(era_mode, weather)
else:
weather = "二日凌空"
era_mode = "亂紀元"
print(era_mode, weather)
elif sun2 == sun3 == 1:
if sun2_pos == sun3_pos:
weather = "二日連珠"
era_mode = "亂紀元"
print(era_mode, weather)
else:
weather = "二日凌空"
era_mode = "亂紀元"
print(era_mode, weather)
如果要檢視太陽的生成，可以在新增完變數後（即上述**的11行處）新增：
print("sun1: %u , sun2: %u , sun3: %u" % (sun1, sun2, sun3))
print("sun1_pos: %u , sun2_pos: %u , sun3: %u" % (sun1_pos, sun2_pos, sun3_pos))
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