組み込み関数

組み込み関数：importしなくとも使える関数

print(値1, 値2,..., sep = "区切り文字", end = "行末文字")

a = 100
b = 200
c = 300
abc = a + b + c
print(a, b, c, sep = "、", end = "／以上")
print(abc)
# 100、200、300／以上600

type(変数)

a = "test"
print(type(a))
# <class 'str'>
b = 123
print(type(b))
# <class 'int'>
c = 0.123
print(type(c))
# <class 'float'>
d = True
print(type(d))
# <class 'bool'>
e = [a,b,c]
print(type(e))
# <class 'list'>
f = (a,b,c)
print(type(f))
# <class 'tuple'>
g = {a,b,c}
print(type(g))
# <class 'set'>
h = {1:"aa", 2:"bb"}
print(type(h))
# <class 'dict'>

型変換

a = 123
print("string:" + str(a)) # stringにintのままでは接続できない
b = "456"
print(1000 + int(b))

max(数値1, 数値2,...) / min(数値1, 数値2,...)

print(max(1, 9, 3, 6.3))
# 9
print(min(1, 9, 3, 6.3))
# 1

len(イテラブル)

print(len("テスト123"))
# 6
list = ["aa", "bb", "cc", "dd"]
print(len(list))
# 4

round(数値, 桁数)

print(round(100.3))
# 100
print(round(100.5)) # 5は切捨て
# 100
print(round(100.876, 2))
# 100.88

input("表示文字列")

t = input("入力して下さい")
print(t + "!!!")
# 入力して下さい
# "{入力文字}!!!"

range( 開始値, 終了値, ステップ)

for i in range(10, 20, 2): # 終了値は19になる
    print(i)
# 10
# 12
# 14
# 16
# 18

isinstance(変数, (type, type,...))

a = "test"
b = 12.3
print(isinstance(a,(int,float)))
# False
print(isinstance(b,(int,float)))
# True

リスト内の検索 : in / index()

colors = ["red", "blue", "yellow", "black", "blue"]
print("yellow" in colors)
# True
print(colors.index("black"))
# 3