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62 lines
1.9 KiB
Python
62 lines
1.9 KiB
Python
def test_slice_bounds(s):
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# End out of range
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assert s[0:100] == s
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assert s[0:-100] == ""
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# Start out of range
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assert s[100:1] == ""
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# Out of range both sides
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# This is the behaviour in cpython
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# assert s[-100:100] == s
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def expect_index_error(s, index):
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try:
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s[index]
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except IndexError:
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pass
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else:
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assert False
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unicode_str = "∀∂"
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assert unicode_str[0] == "∀"
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assert unicode_str[1] == "∂"
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assert unicode_str[-1] == "∂"
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test_slice_bounds(unicode_str)
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expect_index_error(unicode_str, 100)
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expect_index_error(unicode_str, -100)
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ascii_str = "hello world"
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test_slice_bounds(ascii_str)
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assert ascii_str[0] == "h"
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assert ascii_str[1] == "e"
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assert ascii_str[-1] == "d"
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# test unicode indexing, made more tricky by hebrew being a right-to-left language
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hebrew_text = "בְּרֵאשִׁית, בָּרָא אֱלֹהִים, אֵת הַשָּׁמַיִם, וְאֵת הָאָרֶץ"
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assert len(hebrew_text) == 60
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assert len(hebrew_text[:]) == 60
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assert hebrew_text[0] == "ב"
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assert hebrew_text[1] == "ְ"
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assert hebrew_text[2] == "ּ"
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assert hebrew_text[3] == "ר"
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assert hebrew_text[4] == "ֵ"
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assert hebrew_text[5] == "א"
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assert hebrew_text[6] == "ש"
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assert hebrew_text[5:10] == "אשִׁי"
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assert len(hebrew_text[5:10]) == 5
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assert hebrew_text[-20:50] == "מַיִם, וְא"
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assert len(hebrew_text[-20:50]) == 10
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assert hebrew_text[:-30:1] == "בְּרֵאשִׁית, בָּרָא אֱלֹהִים, "
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assert len(hebrew_text[:-30:1]) == 30
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assert hebrew_text[10:-30] == "ת, בָּרָא אֱלֹהִים, "
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assert len(hebrew_text[10:-30]) == 20
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assert hebrew_text[10:30:3] == "תבר לִ,"
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assert len(hebrew_text[10:30:3]) == 7
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assert hebrew_text[10:30:-3] == ""
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assert hebrew_text[30:10:-3] == "אםהֱאּ "
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assert len(hebrew_text[30:10:-3]) == 7
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assert hebrew_text[30:10:-1] == "א ,םיִהֹלֱא אָרָּב ,"
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assert len(hebrew_text[30:10:-1]) == 20
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